Document and Entity Information Document - USD ($)	12 Months Ended
Document and Entity Information Document - USD ($)	Dec. 31, 2017	Feb. 28, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	NAUTILUS, INC.
Entity Central Index Key	0001078207
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		30,327,978
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 567,409,298

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 27,893	$ 47,874
Available-for-sale securities	57,303	31,743
Trade receivables, net of allowances of $119 and $170	42,685	45,458
Inventories	53,354	47,030
Prepaids and other current assets	7,240	8,020
Income taxes receivable	17	3,231
Total current assets	188,492	183,356
Property, plant and equipment, net	15,827	17,468
Goodwill	62,030	61,888
Other intangible assets, net	57,743	69,800
Deferred income tax assets, non-current	0	11
Other assets	684	543
Total assets	324,776	333,066
Liabilities and Shareholders' Equity
Trade payables	66,899	66,020
Accrued liabilities	10,764	12,892
Warranty obligations, current portion	3,718	3,500
Note payable, current portion, net of unamortized debt issuance costs of $7 and $7	15,993	15,993
Total current liabilities	97,374	98,405
Warranty obligations, non-current	2,399	3,950
Income taxes payable, non-current	2,955	2,403
Deferred income tax liabilities, non-current	8,558	16,991
Other long-term liabilities	2,315	2,481
Note payable, non-current, net of unamortized debt issuance costs of $14 and $21	31,986	47,979
Total liabilities	145,587	172,209
Commitments and contingencies (Note 21)
Common stock - no par value, 75,000 shares authorized, 30,305 and 30,825 shares issued and outstanding	0	578
Retained earnings	179,448	161,496
Accumulated other comprehensive loss	(259)	(1,217)
Total shareholders' equity	179,189	160,857
Total liabilities and shareholders' equity	$ 324,776	$ 333,066

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Condensed Consolidated Balance Sheet Parenthetical [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 119	$ 170
Unamortized debt issuance costs	7	7
Unamortized debt issuance costs, noncurrent	$ 14	$ 21
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	30,305,000	30,825,000
Common stock, shares outstanding	30,305,000	30,825,000

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 406,184	$ 406,039	$ 335,764
Cost of sales	202,302	194,514	162,530
Gross profit	203,882	211,525	173,234
Operating expenses:
Selling and marketing	116,222	115,437	101,618
General and administrative	27,111	28,775	21,441
Research and development	15,446	13,919	9,904
Asset impairment charge	8,800	0	0
Total operating expenses	167,579	158,131	132,963
Operating income	36,303	53,394	40,271
Other income (expense):
Interest income	653	234	218
Interest expense	(1,552)	(1,928)	(22)
Other, net	301	(119)	(445)
Total other expense, net	(598)	(1,813)	(249)
Income from continuing operations before income taxes	35,705	51,581	40,022
Income tax expense	8,080	16,480	13,219
Income from continuing operations	27,625	35,101	26,803
Discontinued operations:
Loss from discontinued operations before income taxes	(1,713)	(1,077)	(601)
Income tax benefit of discontinued operations		(154)	(400)
Loss from discontinued operations	(1,358)	(923)	(201)
Net income	$ 26,267	$ 34,178	$ 26,602
Basic net income per share
Basic income per share from continuing operations (in dollars per share)	$ 0.90	$ 1.13	$ 0.86
Basic income (loss) per share from discontinued operations (in dollars per share)	(0.04)	(0.03)	(0.01)
Basic net income per share (in dollars per share)	0.86	1.10	0.85
Diluted net income per share
Diluted income per share from continuing operations (in dollars per share)	0.89	1.12	0.85
Diluted income (loss) per share from discontinued operations (in dollars per share)	(0.04)	(0.03)	(0.01)
Diluted net income per share (in dollars per share)	$ 0.85	$ 1.09	$ 0.84
Shares used in per share calculations:
Basic (in shares)	30,671	31,032	31,288
Diluted (in shares)	31,010	31,301	31,589

Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 26,267	$ 34,178	$ 26,602
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gain (loss) on marketable securities, net of income tax expense (benefit) of $(27), $5, and $1	(56)	8	2
Gain (loss) on derivative securities, effective portion, net of income tax expense (benefit) of $171, $(14), and $0	240	(24)	0
Foreign currency translation adjustment, net of income tax expense (benefit) of $1, $(5), and $17	774	126	(1,021)
Other comprehensive income (loss)	958	110	(1,019)
Comprehensive income	$ 27,225	$ 34,288	$ 25,583

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on marketable securities tax expense (benefit)	$ (27)	$ 5	$ 1
Loss on derivative securities tax benefit (expense)	171	(14)	0
Foreign currency translation tax expense (benefit)	$ 1	$ (5)	$ 17

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2014	$ 111,072	$ 8,033	$ 103,347	$ (308)
Balance, shares at Dec. 31, 2014		31,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,602		26,602
Unrealized loss on marketable securities, net of income tax benefit of $(27)	2			2
Gain on derivative securities, effective portion, net of income tax expense of $171	0
Foreign currency translation adjustment, including income tax expense (benefit)	(1,021)			(1,021)
Stock-based compensation expense	1,484	$ 1,484
Common stock issued under equity compensation plan, shares		377
Common stock issued under equity compensation plan, net of shares withheld for tax payments	275	$ 275
Common stock issued under employee stock purchase plan, shares		7
Common stock issued under employee stock purchase plan	116	$ 116
Tax benefit related to stock-based awards	28	$ 28
Repurchased shares, in shares		(712)
Repurchased shares	(11,567)	$ (9,140)	(2,427)
Balance, shares at Dec. 31, 2015		31,005
Ending balance at Dec. 31, 2015	126,991	$ 796	127,522	(1,327)
Beginning balance at Dec. 31, 2014	111,072	$ 8,033	103,347	(308)
Balance, shares at Dec. 31, 2014		31,333
Balance, shares at Dec. 31, 2017		30,305
Ending balance at Dec. 31, 2017	179,189	$ 0	179,448	(259)
Beginning balance at Dec. 31, 2015	126,991	$ 796	127,522	(1,327)
Balance, shares at Dec. 31, 2015		31,005
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	34,178		34,178
Unrealized loss on marketable securities, net of income tax benefit of $(27)	8			8
Gain on derivative securities, effective portion, net of income tax expense of $171	(24)			(24)
Foreign currency translation adjustment, including income tax expense (benefit)	126			126
Stock-based compensation expense	2,613	$ 2,613
Common stock issued under equity compensation plan, shares		116
Common stock issued under equity compensation plan, net of shares withheld for tax payments	117	$ 117
Common stock issued under employee stock purchase plan, shares		24
Common stock issued under employee stock purchase plan	381	$ 381
Tax benefit related to stock-based awards	1,857	$ 1,857
Repurchased shares, in shares		(320)
Repurchased shares	(5,390)	$ (5,186)	(204)
Balance, shares at Dec. 31, 2016		30,825
Ending balance at Dec. 31, 2016	160,857	$ 578	161,496	(1,217)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,267		26,267
Unrealized loss on marketable securities, net of income tax benefit of $(27)	(56)			(56)
Gain on derivative securities, effective portion, net of income tax expense of $171	240
Foreign currency translation adjustment, including income tax expense (benefit)	774			774
Stock-based compensation expense	1,856	$ 1,884	(28)
Common stock issued under equity compensation plan, shares		231
Common stock issued under equity compensation plan, net of shares withheld for tax payments	(181)	$ (181)
Common stock issued under employee stock purchase plan, shares		37
Common stock issued under employee stock purchase plan	487	$ 487
Repurchased shares, in shares		(788)
Repurchased shares	(11,055)	$ (2,768)	(8,287)
Balance, shares at Dec. 31, 2017		30,305
Ending balance at Dec. 31, 2017	$ 179,189	$ 0	$ 179,448	$ (259)

Consolidated Statements of Stockholders' Equity - Parenthetical - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Unrealized gain (loss) on marketable securities tax expense (benefit)	$ (27)	$ 5	$ 1
Loss on derivative securities tax benefit	(171)	14	0
Foreign currency translation tax expense (benefit)	$ 1	$ (5)	$ 17

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Income from continuing operations	$ 27,625	$ 35,101	$ 26,803
Loss from discontinued operations	(1,358)	(923)	(201)
Net income	26,267	34,178	26,602
Adjustments to reconcile net income to net cash provided by operating activities:
Asset impairment charge	8,800	0	0
Depreciation and amortization	8,643	7,874	3,412
Bad debt expense	311	289	786
Inventory lower-of-cost-or-market/NRV adjustments	1,067	245	1,583
Stock-based compensation expense	1,856	2,613	1,484
Loss on asset disposals	56	147	313
Deferred income taxes, net of valuation allowances	(8,556)	9,510	11,669
Excess tax benefit related to stock-based awards	0	(1,857)	(28)
Other	(117)	5	0
Changes in operating assets and liabilities:
Trade receivables	2,516	(694)	(6,812)
Inventories	(7,526)	(3,110)	(7,147)
Prepaids and other current assets	1,080	(1,415)	1,365
Income taxes receivable	3,214	(2,792)	(389)
Trade payables	449	6,464	4,506
Accrued liabilities, including warranty obligations	(3,044)	(5,606)	3,776
Net cash provided by operating activities	35,016	45,851	41,120
Cash flows from investing activities:
Acquisition of business, net of cash acquired	0	(3,468)	(114,062)
Purchases of property, plant and equipment and intangible assets	(3,792)	(4,656)	(5,734)
Purchases of available-for-sale-securities	(88,413)	(34,739)	(61,933)
Proceeds from maturities of available-for-sale securities	62,939	32,923	55,292
Proceeds from sales of available-for-sale securities	0	71	3,602
Net cash used in investing activities	(29,266)	(9,869)	(122,835)
Cash flows from financing activities:
Proceeds from long-term debt	0	0	80,000
Proceeds from employee stock purchases	16,000	16,000	0
Proceeds from employee stock purchases	487	381	116
Tax payments related to stock award issuances	560	356	1,050
Excess tax benefit related to stock-based awards	(741)	(239)	(775)
Excess tax benefit related to stock-based awards	0	1,857	28
Payments for stock repurchases	(11,055)	(5,390)	(11,567)
Net cash provided by (used in) financing activities	(26,749)	(19,035)	68,852
Effect of exchange rate changes on cash and cash equivalents	1,018	149	(1,565)
Increase (decrease) in cash and cash equivalents	(19,981)	17,096	(14,428)
Beginning of year	47,874	30,778	45,206
End of year	27,893	47,874	30,778
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net	11,630	11,511	1,308
Cash paid for interest	1,545	1,920	22
Acquisition consideration owed but not yet paid	0	0	2,813
Capital expenditures incurred but not yet paid	404	210	1,000
Loan fees incurred but not yet paid	$ 0	$ 0	$ 36

Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Significant Accounting Policies

SIGNIFICANT ACCOUNTING POLICIES

Organization and Business

Nautilus, Inc. and subsidiaries (collectively, "Nautilus", the "Company", "we" or "us") was founded in 1986 and incorporated in the State of Washington in 1993. Our headquarters are located in Vancouver, Washington.

We are committed to providing innovative, quality solutions to help people achieve their fitness goals through a fit and healthy lifestyle. Our principal business activities include designing, developing, sourcing and marketing high-quality cardio and strength fitness products and related accessories for consumer use, primarily in the U.S., Canada, and Europe. Our products are sold under some of the most-recognized brand names in the fitness industry: Nautilus^®, Bowflex^®, Octane Fitness^®, Schwinn^® and Universal^®.

We market our products through two distinct distribution channels, Direct and Retail, which we consider to be separate business segments. Our Direct business offers products directly to consumers through television advertising, catalogs and the Internet. Our Retail business offers our products through a network of independent retail companies and specialty retailers with stores and websites located in the U.S. and internationally. We also derive a portion of our revenue from the licensing of our brands and intellectual property.

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and relate to Nautilus, Inc. and its subsidiaries, all of which are wholly-owned, directly or indirectly. Intercompany transactions and balances have been eliminated in consolidation.

Discontinued Operations

Results from discontinued operations relate to the disposal of our former Commercial business, which was completed in April 2011. We reached substantial completion of asset liquidation at December 31, 2012. Although there was no revenue related to our former Commercial business during 2015 through 2017, we continue to have product liability and other legal expenses associated with product previously sold into the Commercial channel.

Results of operations related to the Commercial business have been presented in the consolidated financial statements as discontinued operations for all periods presented.

Critical Accounting Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses and the disclosure of contingent assets and liabilities in the financial statements. Our critical accounting estimates relate to the following:


•	Sales discounts and allowances;


•	Goodwill and other long-term assets valuation;


•	Product warranty obligations; and


•	Unrecognized tax benefits.

Actual results could differ from our estimates.

Concentrations

Financial instruments that potentially subject us to concentrations of credit risk consist principally of cash and cash equivalents held in bank accounts in excess of federally-insured limits and trade receivables. Trade receivables are generally unsecured and therefore collection is affected by the economic conditions in each of our principal markets.

We rely on third-party contract manufacturers in Asia for substantially all of our products and for certain product engineering support. Business operations could be disrupted by natural disasters, difficulties in transporting products from non-U.S. suppliers, as well as political, social or economic instability in the countries where contract manufacturers or their vendors or customers conduct business. While any such contract manufacturing arrangement could be replaced over time, the temporary loss of the services of any primary contract manufacturer could delay product shipments and cause a significant disruption in our operations.

We derive a significant portion of our net sales from a small number of our Retail customers. A loss of business from one or more of these large customers, if not replaced with new business, would negatively affect our operating results and cash flows. In each of 2017, 2016 and 2015, one customer accounted for more than 10%, but less than 15%, of our net sales.

Cash and Cash Equivalents

All highly liquid investments with original maturities of three months or less at purchase are considered to be cash equivalents. As of December 31, 2017, and 2016, cash equivalents consisted of money market funds and commercial paper, and totaled $12.9 million and $13.6 million, respectively.

Available-For-Sale Securities

We classify our marketable securities as available-for-sale and, accordingly, record them at fair value. Marketable securities with original maturities of greater than three months and remaining maturities of less than one year are classified as short-term investments. Investments with maturities beyond one year may be classified as short-term based on their highly liquid nature and because such marketable securities represent the investment of cash that is available for current operations. Unrealized holding gains and losses, which are immaterial, are excluded from earnings and are reported net of tax in other comprehensive income until realized. Dividend and interest income is recognized when earned. Realized gains and losses, which were not material in 2017 or 2016, are included in earnings and are derived using the specific identification method for determining the cost of securities sold.

We periodically evaluate whether declines in fair values of our investments below their cost are "other-than-temporary." This evaluation consists of qualitative and quantitative factors regarding the severity and duration of the unrealized loss, as well as our ability and intent to hold the investment until a forecasted recovery occurs.

For additional information, refer to Note 4, Fair Value Measurements.

Derivative Securities

We record our derivative securities at fair value, and our portfolio currently consists of an interest rate swap contract and foreign currency forward contracts. The fair value of our interest rate swap agreement, which is classified as a cash flow hedge, represents the estimated receipts or payments that would be made to terminate the agreement. The amounts related to the cash flow hedge are recorded as deferred gains or losses in our consolidated balance sheets with the offset recorded in accumulated other comprehensive loss, net of tax.

We enter into foreign exchange forward contracts to offset the earnings impacts of exchange rate fluctuations on certain monetary assets and liabilities. A hypothetical 10% increase in interest rates, or a 10% movement in the currencies underlying our foreign currency derivative positions, would not have material impacts on our results of operations, financial position or cash flows. Gains and losses on foreign currency forward contracts are recognized in the Other, net line of our consolidated statements of operations.

We do not enter into derivative instruments for any purpose other than to manage our interest rate or foreign currency exposure. That is, we do not engage in interest rate or currency exchange rate speculation using derivative instruments.

Trade Receivables

Accounts receivable primarily consists of trade receivables due from our Retail segment customers. We determine an allowance for doubtful accounts based on historical customer experience and other currently available evidence. When a specific account is deemed uncollectible, the account is written off against the allowance.

Inventories

Inventories are stated at the lower of cost and net realizable value ("NRV"), with cost determined based on the first-in, first-out method. We establish inventory allowances for excess, slow-moving and obsolete inventory based on inventory levels, expected product life and forecasted sales. Inventories are written down to NRV based on historical demand, competitive factors, changes in technology and product lifecycles.

Property, Plant and Equipment

Property, plant and equipment is stated at cost, net of accumulated depreciation. Improvements or betterments which add new functionality or significantly extend the life of an asset are capitalized. Expenditures for maintenance and repairs are expensed as incurred. The cost of assets retired, or otherwise disposed of, and the related accumulated depreciation, are removed from the accounts at the time of disposal. Gains and losses resulting from asset sales and dispositions are recognized in the period in which assets are disposed. Depreciation is recognized, using the straight-line method, over the lesser of the estimated useful lives of the assets or, in the case of leasehold improvements, the lease term, including renewal periods if we expect to exercise our renewal

options. Depreciation on automobiles, computer software and equipment, machinery and equipment, and furniture and fixtures is determined based on estimated useful lives, which generally range from three-to-seven years.

Goodwill

Goodwill consists of the excess of acquisition costs over the fair values of net assets acquired in business combinations. It is not amortized, but rather is tested at the reporting unit level at least annually for impairment or more frequently if triggering events or changes in circumstances indicate impairment. Initially, qualitative factors are considered to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Some of these qualitative factors may include macroeconomic conditions, industry and market considerations, a change in financial performance, entity-specific events, a sustained decrease in share price, and consideration of the difference between the fair value and carrying amount of a reporting unit as determined in the most recent quantitative assessment. If, through this qualitative assessment, the conclusion is made that it is more likely than not that a reporting unit's fair value is less than its carrying amount, a quantitative impairment analysis is performed. A quantitative impairment analysis involves estimating the fair value of a reporting unit using widely-accepted valuation methodologies including the income and market approaches, which requires the use of estimates and assumptions. These estimates and assumptions include revenue growth rates, discounts rates, and determination of appropriate market comparables. If the fair value of the reporting unit is less than its carrying amount, an impairment loss is recognized in an amount equal to that excess, not to exceed the carrying amount of the goodwill.

We performed assessments of goodwill in the fourth quarters of 2017, 2016 and 2015, and determined no impairments were indicated in those years. We evaluate goodwill at the reporting unit level. Our goodwill asset related to our Canadian subsidiary is attributable to our Direct reporting unit, and our goodwill related to the Octane acquisition is attributable to our Retail reporting unit. For further information regarding goodwill, see Note 9, Goodwill.

Other Intangible Assets

Indefinite-lived intangible assets consist of acquired trademarks, specifically trade names. Indefinite-lived intangible assets are stated at cost and are not amortized; instead, they are tested for impairment at least annually. We review our indefinite-lived trademarks for impairment in the fourth quarter of each year and when events or changes in circumstances indicate that the assets may be impaired. The fair value of trademarks is estimated using the relief-from-royalty method to estimate the value of the cost savings and a discounted cash flows method to estimate the value of future income. The sum of these two values for each trademark is the fair value of the trademark. If the carrying amount of trademarks exceeds the estimated fair value, we calculate impairment as the excess of carrying amount over the estimate of fair value.

We tested our indefinite-lived trademarks for impairment in the fourth quarters of 2017, 2016 and 2015. During the fourth quarter of 2017, we identified impairment indicators in our Octane Fitness brand name originally acquired through the Octane Fitness acquisition on December 31, 2015. Ongoing weakness in the specialty retail channel, as a result of retailer consolidation, has had a negative impact on Octane branded sales and projected growth trends. We utilized the relief-from-royalty method to quantify the impairment, resulting in an $8.8 million non-cash impairment charge for 2017. The impairment charge is recorded in operating expenses on the consolidated statements of operations. We determined no impairment was indicated in 2016 and 2015 for our indefinite-lived intangible assets.

Definite-lived intangible assets, primarily acquired trade names, customer relationships, patents and patent rights, are stated at cost, net of accumulated amortization, and are evaluated for impairment as discussed below under Impairment of Long-Lived Assets. We recognize amortization expense for our definite-lived intangible assets on a straight-line basis over the estimated useful lives. For further information regarding other intangible assets, see Note 10, Other Intangible Assets.

Impairment of Long-Lived Assets

Long-lived assets, including property, plant and equipment and definite-lived intangible assets, are evaluated for impairment when events or circumstances indicate the carrying value may be impaired. When such an event or condition occurs, we estimate the future undiscounted cash flows to be derived from the use and eventual disposition of the asset to determine whether a potential impairment exists. If the carrying value exceeds estimated future undiscounted cash flows, we record impairment expense to reduce the carrying value of the asset to its estimated fair value. No impairment charges were recorded in 2017, 2016 and 2015.

Share Repurchases

Shares of our common stock may be repurchased from time to time as authorized by our Board of Directors. Repurchases may be made in open market transactions at prevailing prices, in privately negotiated transactions, or by other means in accordance with federal securities laws. Share repurchases are funded from existing cash balances, and repurchased shares are retired and returned to unissued authorized shares. These repurchases are accounted for as reductions to our common stock to the extent available with remaining amounts allocated against retained earnings.

Revenue Recognition

Direct and Retail product sales and shipping revenues are recorded when products are shipped and title passes to customers. In most instances, Retail sales to customers are made pursuant to a sales contract that provides for transfer of both title and risk of loss to the customer upon our delivery to the carrier. For Direct sales, revenue is generally recognized when products are shipped. Revenue is recognized net of applicable sales incentives, such as promotional discounts, rebates and return allowances. We estimate the revenue impact of incentive programs based on the planned duration of the program and historical experience.

Many Direct business customers finance their purchases through a third-party credit provider, for which we pay a commission or financing fee to the credit provider. Revenue for such transactions is recognized based on the sales price charged to the customer and the related commission or financing fee is included in selling and marketing expense.

Sales Discounts and Returns Allowance

Product sales and shipping revenues are reported net of promotional discounts and return allowances. We estimate the revenue impact of retail sales incentive programs based on the planned duration of the program and historical experience. If the amount of sales incentives is reasonably estimable, the impact of such incentives is recorded at the later of the time the customer is notified of the sales incentive or the time of the sale. We estimate our liability for product returns based on historical experience and record the expected obligation as a reduction of revenue. If actual return costs differ from previous estimates, the amount of the liability and corresponding revenue are adjusted in the period in which such costs occur. Activity in our sales discounts and returns allowance was as follows (in thousands):



	2017			2016			2015
Balance, January 1	$	5,901		$	5,677		$	4,296
Charges to reserve	18,377			12,935			16,700
Reductions for sales discounts and returns	(17,358		)	(12,711		)	(15,569		)
Business acquisition (Note 2)	—			—			250
Balance, December 31	$	6,920		$	5,901		$	5,677

Taxes Collected from Customers and Remitted to Governmental Authorities

Taxes collected from customers and remitted to governmental authorities are recorded on a net basis and excluded from net sales.

Shipping and Handling Fees

Shipping and handling fees billed to customers are recorded net of discounts and included in both net sales and cost of sales.

Cost of Sales

Cost of sales primarily consists of: inventory costs; royalties paid to third parties; employment and occupancy costs of warehouse and distribution facilities, including depreciation of improvements and equipment; transportation expenses; product warranty expenses; distribution information systems expenses; and allocated expenses for shared administrative functions.

Product Warranty Obligations

Our products carry defined warranties for defects in materials or workmanship which, according to their terms, generally obligate us to pay the costs of supplying and shipping replacement parts to customers and, in certain instances, pay for labor and other costs to service products. Outstanding product warranty periods range from thirty days to, in limited circumstances, the lifetime of certain product components. We record a liability at the time of sale for the estimated costs of fulfilling future warranty claims. If necessary, we adjust the liability for specific warranty-related matters when they become known and are reasonably estimable. Estimated warranty expense is included in cost of sales, based on historical warranty claim experience and available product quality data. Warranty expense is affected by the performance of new products, significant manufacturing or design defects not discovered until after the product is delivered to the customer, product failure rates, and higher or lower than expected repair costs. If warranty expense differs from previous estimates, or if circumstances change such that the assumptions inherent in previous estimates are no longer valid, the amount of product warranty obligations is adjusted accordingly.

Litigation and Loss Contingencies

From time to time, we may be involved in various claims, lawsuits and other proceedings. These legal and tax proceedings involve uncertainty as to the eventual outcomes and losses which may be realized when one or more future events occur or fail to occur. We record expenses for litigation and loss contingencies as a component of general and administrative expense when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. When a loss contingency is not both probable and estimable, we do not establish an accrued liability. However, if the loss (or an additional loss in excess of the accrual)

is at least a reasonable possibility and material, then we disclose an estimate of the possible loss or range of loss, if such estimate can be made, or disclose that an estimate cannot be made.

Advertising and Promotion

We expense our advertising and promotion costs as incurred. Production costs of television advertising commercials are recorded in prepaids and other current assets until the initial broadcast, at which time such costs are expensed. Advertising and promotion costs are included in selling and marketing expenses and totaled $66.4 million, $60.7 million and $54.8 million for the years ended December 31, 2017, 2016 and 2015, respectively. Prepaid advertising and promotion costs were $1.5 million and $3.5 million as of December 31, 2017 and 2016, respectively.

Research and Development

Internal research and development costs, which primarily consist of salaries and wages, employee benefits, expenditures for materials, and fees to use licensed technologies, are expensed as incurred. Third-party research and development costs for products under development or being researched, if any, are expensed as the contracted work is performed. In addition, we capitalize costs to develop software for internal use in accordance with accounting guidance.

Income Taxes

We account for income taxes based on the asset and liability method, whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using the enacted tax rates expected to be in effect when the temporary differences are expected to be included, as income or expense, in the applicable tax return. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in the period of the enactment. Valuation allowances are provided against deferred income tax assets if we determine it is more likely than not that such assets will not be realized.

Unrecognized Tax Benefits

We recognize a tax benefit from an uncertain tax position when it is more likely than not that the position will be sustained based on the technical merits of the position upon examination, including resolutions of any related appeals or litigation. We recognize tax-related interest and penalties as a component of income tax expense.

Foreign Currency Translation

We translate the accounts of our non-U.S. subsidiaries into U.S. dollars as follows: revenues, expenses, gains and losses are translated at weighted-average exchange rates during the year; and assets and liabilities are translated at the exchange rate on the balance sheet date. Translation gains and losses are reported in our consolidated balance sheets as a component of accumulated other comprehensive income.

Gains and losses arising from foreign currency transactions, including transactions between us and our non-U.S. subsidiaries, are recorded as a component of other income (expense) in our consolidated statements of operations.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, trade receivables, prepaids and other current assets, trade payables and accrued liabilities approximate fair value due to their short maturities.

For additional information on financial instruments recorded at fair value on a recurring basis as of December 31, 2017 and 2016, refer to Note 4, Fair Value Measurements.

Stock-Based Compensation

We recognize stock-based compensation expense on a straight-line basis over the applicable vesting period, based on the grant-date fair value of the award. To the extent a stock-based award is subject to performance conditions, the amount of expense recorded in a given period, if any, reflects our assessment of the probability of achieving the performance targets.

Fair value of stock options is estimated using the Black-Scholes-Merton option valuation model; fair value of performance share unit ("PSU") awards, restricted stock unit ("RSU") awards and restricted stock awards ("RSA") is based on the closing market price on the day preceding the grant.

Prior to our adoption of Financial Accounting Standards Board's ("FASB") Accounting Standards Update ("ASU") 2016-09 in January 2017, we estimated future forfeitures, at the time of grant and in subsequent periods, based on historical turnover rates, previous forfeiture experience and changes in the business or key personnel that would suggest future forfeitures may differ from historical data. We recognized compensation expense for only those stock options and other stock-based awards that were expected to vest. We reevaluated estimated forfeitures monthly and, if applicable, recognized a cumulative effect adjustment in the period

of the change if the revised estimate of the impact of forfeitures differed significantly from the previous estimate. With our adoption of ASU 2016-09, we changed our accounting treatment of forfeiture expense reversals from "at vest date" to "at forfeiture date." As a result, we no longer estimate future forfeitures prior to their actual occurrence.

Shares to be issued upon the exercise of stock options or the vesting of stock awards will come from newly issued shares.

Income Per Share Amounts

Basic income per share amounts were computed using the weighted average number of common shares outstanding. Diluted income per share amounts were calculated using the number of basic weighted average shares outstanding increased by dilutive potential common shares related to stock-based awards, as determined by the treasury stock method.

New Accounting Pronouncements

Newly-Adopted Pronouncements

ASU 2017-04

In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment." ASU 2017-04 simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. An entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, if applicable. The loss recognized should not exceed the total amount of goodwill allocated to the reporting unit. The same impairment test also applies to any reporting unit with a zero or negative carrying amount. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 is effective for public companies' fiscal years, including interim periods within those fiscal years, beginning after December 15, 2019, on a prospective basis. Early adoption is permitted for interim or annual goodwill impairment tests performed after January 1, 2017. Our early adoption of ASU 2017-04 for our annual goodwill impairment testing as of October 1, 2017 did not have a material effect on our financial position, results of operations or cash flows.

ASU 2016-09

In March 2016, the FASB issued ASU 2016-09, "Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for public companies' annual periods, including interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted subject to certain requirements, and the method of application (i.e., retrospective, modified retrospective or prospective) depends on the transaction area that is being amended. Related to forfeitures, we changed our accounting treatment of forfeiture expense reversals from "at vest date" to "at forfeiture date." We applied the guidance on a modified retrospective basis, which resulted in a $28,308 cumulative effective adjustment and reduction to beginning retained earnings as of January 1, 2017. In addition, related to excess tax benefits, we recognized all current period expense through the statement of operations and presented excess tax benefits as an operating cash flow, applied prospectively, with no adjustment to prior periods. The adoption of ASU 2016-09 in January 2017 did not have a material impact on our financial position, results of operations or cash flows.

ASU 2015-11

In July 2015, the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory (Topic 330).” ASU 2015-11 simplifies the accounting for the valuation of all inventory not accounted for using the last-in, first-out (“LIFO”) method by prescribing inventory be valued at the lower of cost and net realizable value. ASU 2015-11 is effective for public companies' annual periods, including interim periods within those fiscal years, beginning after December 15, 2016 on a prospective basis. Early adoption is permitted. Our adoption of ASU 2015-11 in January 2017 did not have a material effect on our financial position, results of operations or cash flows.

Issued Not Yet Adopted Pronouncements

ASU 2017-12

In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities." ASU 2017-12 provides better alignment of an entity's risk management activities and financial reporting of hedges through changes to both the designation and measurement guidance for qualifying hedging relationships. In addition, the amendments in ASU 2017-12 also simplify the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements to increase the understandability of the results of an entity's intended hedging strategies. ASU 2017-12 is effective for public companies' fiscal years, including interim periods within those fiscal years, beginning after

December 15, 2018. Early application is permitted in any interim period after issuance of the new standard, with effect of adoption reflected as of the beginning of the fiscal year of adoption. For cash flow and net investment hedges existing as of the adoption date, an entity should apply a cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness to accumulated other comprehensive income and opening retaining earnings. Amended presentation and disclosure guidance is required only prospectively, and certain transition elections are available upon adoption. While we do not expect the adoption of ASU 2017-12 to have a material effect on our business, we are evaluating any potential impact that adoption of ASU 2017-12 may have on our financial position, results of operations or cash flows.

ASU 2017-09

In May 2017, the FASB issued ASU 2017-09, "Compensation - Stock Compensation (Topic 718) - Scope in Modification Accounting." ASU 2017-09 provides clarity and reduces diversity in practice and cost and complexity when applying the guidance in Topic 718 to a change to the terms or conditions of a share-based payment award. An entity should account for the effects of a modification unless all of certain criteria are met. Those criteria relate to fair value, vesting conditions and classification of the modified award. If all three conditions are the same for the modified award as for the original award, then the entity should not account for the effects of the modification. ASU 2017-09 is effective for all entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period, for public business entities for reporting periods for which financial statements have not yet been issued. We do not expect the adoption of ASU 2017-09 to have a material effect on our financial position, results of operations or cash flows.

ASU 2016-15

In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments." The amendments in ASU 2016-15 are intended to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows, with the intent of reducing diversity in practice for the eight (8) types of cash flows identified. ASU 2016-15 is effective for public companies' fiscal years, including interim periods within those fiscal years, beginning after December 15, 2017. Early adoption is permitted. Entities must apply the guidance retrospectively to all periods presented, but may apply it prospectively if retrospective application would be impracticable. We do not expect the adoption of ASU 2016-15 to have a material effect on our financial position, results of operations or cash flows.

ASU 2016-13

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments." The amendments in ASU 2016-13 replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 is effective for public companies' annual periods, including interim periods within those fiscal years, beginning after December 15, 2019, using a modified-retrospective approach, with certain exceptions. Early adoption is permitted. While we do not expect the adoption of ASU 2016-13 to have a material effect on our business, we are evaluating any potential impact that adoption of ASU 2016-13 may have on our financial position, results of operations or cash flows.

ASU 2016-02

In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 replaces the existing guidance in Accounting Standards Codification ("ASC") 840, Leases. The new standard would require companies and other organizations to include lease obligations on their balance sheets, including a dual approach for lessee accounting under which a lessee would account for leases as finance leases or operating leases. Both finance leases and operating leases will result in the lessee recognizing a right-of-use ("ROU") asset and a corresponding lease liability. For finance leases the lessee would recognize interest expense and amortization of the ROU asset, and for operating leases the lessee would recognize a straight-line total lease expense. Lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. ASU 2016-02 is effective for public companies' annual periods, and interim periods within those fiscal years, beginning after December 15, 2018. We are currently assessing the impact that ASU 2016-02 will have on our consolidated financial statements, and expect that the primary impact upon adoption will be the recognition, on a discounted basis, of our minimum commitments under non-cancellable operating leases on our consolidated balance sheets resulting in the recording of right of use assets and lease liabilities.

ASU 2014-09

In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers." ASU 2014-09 replaces most existing revenue recognition guidance, and requires companies to recognize revenue based upon the transfer of promised goods and/or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and/or services. In addition, the new guidance requires enhanced disclosures, including revenue recognition policies to identify performance obligations to customers and significant judgments in measurement and recognition. ASU 2014-09 is effective, as amended, for annual and interim periods beginning on or after December 15, 2017, applied retrospectively to each

prior period presented or retrospectively with a cumulative effect adjustment recognized as of the adoption date. We are adopting the new standard on January 1, 2018 using the full retrospective method.

We have identified and analyzed our principal revenue streams by channel, including potential impacts on the timing of recognition of variable consideration and consideration payable to a customer, primarily related to our sales discounts and allowances programs, and contract costs, mainly sales commissions, as well as presentation of our extended warranty and installation services revenue. We are also substantially complete with our review of significant contracts and our evaluation of the potential changes to our business processes, controls, systems and disclosures resulting from adoption of the new standard. We expect to finalize documentation of these assessments during the first quarter of 2018. Based on our analyses, we have determined there are no material changes to prior periods' reported amounts. Further, we have identified potential accounting and financial reporting impacts to our business processes, controls, systems and disclosures as a result of the new standard, and we are preparing for those changes. In addition, while we do not expect the adoption of ASU 2014-09, as amended, to have a material effect on our financial position, results of operations or cash flows, we do anticipate significant additional disclosure requirements upon adoption of the new standard.

Business Acquisition

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Business Acquisition

BUSINESS ACQUISITION

On December 31, 2015, we acquired all of the outstanding capital stock of OF Holdings, Inc., sole parent of Octane Fitness, LLC ("Octane") for an aggregate base purchase price of $115.0 million, plus net adjustments for working capital and cash acquired on the closing date. We funded the acquisition through an $80.0 million term loan and cash on hand. Based in Brooklyn Park, Minnesota, Octane is a leader in zero-impact training with a line of fitness equipment focused on Retail specialty and commercial channels. The acquisition of Octane strengthened and diversified our brand portfolio, broadened our distribution and deepened our talent pool. Octane's business is highly complementary to our existing business from both product and channel perspectives.

Purchase Price Allocation

Acquired assets and liabilities were recorded at estimated fair value as of the acquisition date, and subsequently adjusted and finalized during 2016. The excess of the purchase price over the fair value of identifiable net assets resulted in the recognition of goodwill of $59.7 million, all of which was assigned to the Retail segment. The goodwill is not deductible for income tax purposes.

The following table summarizes the fair values of the net assets acquired and liabilities assumed as of the acquisition date, including all measurement period adjustments (in thousands):



	Final valuation at December 31, 2016
Cash	$	7,759
Accounts receivable	12,476
Inventories	13,134
Prepaid expenses	885
Deferred tax assets	1,303
Property, plant and equipment	3,372
Intangible assets	63,100
Total assets acquired	102,029

Accounts payable	6,497
Accrued liabilities	2,968
Warranty obligations	5,550
Deferred tax liabilities, non-current	21,033
Other non-current liabilities	390
Total liabilities assumed	36,438

Net identifiable assets acquired	65,591
Goodwill	59,705
Net assets acquired	$	125,296

Summary of Unaudited Pro Forma Information

The following table reflects the unaudited pro forma consolidated results of operations for the periods presented, as though the acquisition of Octane had occurred on January 1, 2014 (in thousands, except per share amounts):



		(unaudited)
		Year Ended December 31,
		2016		2015
Net sales		$	406,039	$	400,078
Net income		35,683		29,352
Net income per share:
	Basic	$	1.15	$	0.94
	Diluted	1.14		0.93

The unaudited pro forma financial information is presented for illustrative purposes only and is not indicative of the results of operations that would have been realized if the acquisition had been completed on the date indicated, nor is it indicative of future operating results. The pro forma results do not include, for example, the effects of anticipated synergies from combining the two companies.

Discontinued Operation

12 Months Ended

Dec. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operation

DISCONTINUED OPERATIONS

Following is a summary of certain financial information regarding our discontinued operations (in thousands):



	Year Ended December 31,
	2017			2016			2015
Loss from discontinued operations before income taxes	$	(1,713	)	$	(1,077	)	$	(601	)
Income tax benefit	(355		)	(154		)	(400		)
Total loss from discontinued operations	$	(1,358	)	$	(923	)	$	(201	)

During 2017, our litigation with Biosig Instruments, Inc. ("Biosig") was settled. The litigation began in 2004 and alleged patent infringement in connection with our incorporation of heart rate monitors into certain cardio products of our former Commercial business. We paid Biosig $1.2 million under the settlement, and the matter was dismissed with prejudice. The settlement was expensed in discontinued operations in 2017.

Fair Value Measurements (Notes)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

Factors used in determining the fair value of financial assets and liabilities are summarized into three broad categories:


•	Level 1 - observable inputs such as quoted prices (unadjusted) in active liquid markets for identical securities as of the reporting date;


•	Level 2 - other significant directly or indirectly observable inputs, including quoted prices for similar securities, interest rates, prepayment speeds and credit risk; or observable market prices in markets with insufficient volume and/or infrequent transactions; and


•	Level 3 - significant inputs that are generally unobservable inputs for which there is little or no market data available, including our own assumptions in determining fair value.

Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):



	December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash Equivalents
Money market funds	$	10,946	$	—	$	—	$	10,946
Commercial paper	—		1,996		—		1,996
Total cash equivalents	10,946		1,996		—		12,942

Available-for-Sale Securities
Certificates of deposit⁽¹⁾	—		19,875		—		19,875
Corporate bonds	—		29,239		—		29,239
U.S. government bonds	—		8,189		—		8,189
Total available-for-sale securities	—		57,303		—		57,303

Derivatives
Interest rate swap contract	—		372		—		372
Foreign currency forward contracts	—		390		—		390
Total derivatives	—		762		—		762
Total assets measured at fair value	$	10,946	$	60,061	$	—	$	71,007



	December 31, 2016
	Level 1		Level 2			Level 3		Total
Assets:
Cash Equivalents
Money market funds	$	9,635	$	—		$	—	$	9,635
Commercial paper	—		3,999			—		3,999
Total cash equivalents	9,635		3,999			—		13,634

Available-for-Sale Securities
Certificates of deposit⁽¹⁾	—		22,820			—		22,820
Corporate bonds	—		6,922			—		6,922
U.S. government bonds	—		2,001			—		2,001
Total available-for-sale securities	—		31,743			—		31,743
Total assets measured at fair value	$	9,635	$	35,742		$	—	$	45,377

Liabilities:
Derivatives
Interest rate swap contract	$	—	$	(38	)	$	—	$	(38	)
Total liabilities measured at fair value	$	—	$	(38	)	$	—	$	(38	)

⁽¹⁾ All certificates of deposit are within current FDIC insurance limits.

For our assets measured at fair value on a recurring basis, we recognize transfers between levels at the actual date of the event or change in circumstance that caused the transfer. There were no transfers between levels during the years ended December 31, 2017 and 2016. Additionally, we did not have any changes to our valuation techniques during the years ended December 31, 2017 and 2016.

We classify our marketable securities as available-for-sale and, accordingly, record them at fair value. Level 1 investment valuations are obtained from real-time quotes for transactions in active exchange markets involving identical assets. Level 2 investment valuations are obtained from inputs, other than quoted market prices in active markets for identical assets, that are directly or indirectly observable in the marketplace and quoted prices in markets with limited volume or infrequent transactions. The factors or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. Unrealized holding gains and losses are excluded from earnings and are reported net of tax in comprehensive income until realized.

The fair values of our interest rate swap contract and our foreign currency forward contracts are calculated as the present value of estimated future cash flows using discount factors derived from relevant Level 2 market inputs, including forward curves and volatility levels.

We recognize or disclose the fair value of certain assets, such as non-financial assets, primarily property, plant and equipment, goodwill, other intangible assets and certain other long-lived assets in connection with impairment evaluations. All of our nonrecurring valuations use significant unobservable inputs and therefore fall under Level 3 of the fair value hierarchy. Other than our annual goodwill and indefinite-lived trade names impairment assessments and valuations effective as of October 1, 2017 and 2016, we did not perform any assessments or valuations on assets or liabilities that are valued at fair value on a nonrecurring basis. During the year ended December 31, 2017, we recorded an impairment to our indefinite-lived Octane Fitness trade name in the amount of $8.8 million. For the year ended December 31, 2016, we did not record any other-than-temporary impairments on our financial assets required to be measured at fair value on a nonrecurring basis.

The carrying values of cash and cash equivalents, trade receivables, prepaids and other current assets, trade payables and accrued liabilities approximate fair value due to their short maturities. The carrying value of our term loan approximates its fair value and falls under Level 2 of the fair value hierarchy, as the interest rate is variable and based on current market rates.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Derivatives

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

DERIVATIVES

From time to time, we enter into interest rate swaps to fix a portion of our interest expense, and foreign exchange forward contracts to offset the earnings impacts of exchange rate fluctuations on certain monetary assets and liabilities. We do not enter into derivative instruments for any purpose other than to manage interest rate or foreign currency exposure. That is, we do not engage in interest rate or currency exchange rate speculation using derivative instruments.

As of December 31, 2017, we had a $48.0 million interest rate swap outstanding with JPMorgan Chase Bank, N.A. This interest rate swap matures on December 31, 2020 and has a fixed rate of 1.42% per annum. The variable rate on the interest rate swap is the one-month LIBOR benchmark. At December 31, 2017, the one-month LIBOR rate was 1.35%.

We typically designate all interest rate swaps as cash flow hedges and, accordingly, record the change in fair value for the effective portion of these interest rate swaps in accumulated other comprehensive income rather than current period earnings until the underlying hedged transaction affects earnings. Gains and losses on the derivative representing hedge ineffectiveness are recognized in current earnings. For the years ended December 31, 2017 and 2016, there was no ineffectiveness. As of December 31, 2017, we expect to reclassify a gain of $0.1 million from accumulated other comprehensive loss to earnings within the next twelve months.

We may hedge our net recognized foreign currency assets and liabilities with forward foreign exchange contracts to reduce the risk that our earnings and cash flows will be adversely affected by changes in foreign currency exchange rates. These derivative instruments hedge assets and liabilities that are denominated in foreign currencies and are carried at fair value with changes in the fair value recorded as other income. These derivative instruments do not subject us to material balance sheet risk due to exchange rate movements because gains and losses on these derivatives are intended to offset gains and losses on the assets and liabilities being hedged. As of December 31, 2017, total outstanding contract notional amounts were $22.1 million. At December 31, 2017, these outstanding balance sheet hedging derivatives had maturities of 90 days or less.

The fair value of our derivative instruments was included in our consolidated balance sheets as follows (in thousands):



	Balance Sheet Classification	As of December 31,
	Balance Sheet Classification	2017		2016
Derivative instruments designated as cash flow hedges:
Interest rate swap contract	Prepaids and other current assets	$	134	$	—
	Other assets	238		—
	Accrued liabilities	—		(38		)
		$	372	$	(38	)
Derivative instruments not designated as cash flow hedges:
Foreign currency forward contracts	Prepaids and other current assets	$	390	$	—
		$	390	$	—

The effect of derivative instruments on our consolidated statements of operations was as follows (in thousands):



	Statement of Operations Classification	Year Ended December 31,
	Statement of Operations Classification	2017			2016			2015
Derivative instruments designated as cash flow hedges:
Gain (loss) recognized in other comprehensive income before reclassifications	---	$	80		$	(450	)	$	—
Loss reclassified from accumulated other comprehensive income to earnings for the effective portion	Interest expense	(207		)	(626		)	—
Income tax benefit	Income tax expense	47			200			—

Derivative instruments not designated as cash flow hedges:
Loss recognized in earnings	Other, net	$	(382	)	$	—		$	—
Income tax benefit	Income tax expense	86			—			—

For additional information related to our derivatives, see Notes 4 and 15.

Trade Receivables

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Trade Receivables

TRADE RECEIVABLES

Trade receivables, net, consisted of the following (in thousands):



	As of December 31,
	2017			2016
Trade receivables	$	42,804		$	45,628
Allowance for doubtful accounts	(119		)	(170		)
	$	42,685		$	45,458

Changes in our allowance for doubtful trade receivables were as follows (in thousands):



	2017			2016			2015
Balance, January 1	$	170		$	918		$	108
Charges to bad debt expense	311			289			786
Recoveries (write-offs), net	(362		)	(1,037		)	24
Balance, December 31	$	119		$	170		$	918

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Property, Plant and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):



	Estimated Useful Life (in years)			As of December 31,
	Estimated Useful Life (in years)			2017			2016
Automobiles	5	to	6	$	23		$	139
Leasehold improvements	4	to	20	3,542			3,388
Computer software and equipment	3	to	7	17,024			25,899
Machinery and equipment	3	to	5	15,178			13,085
Furniture and fixtures	5	to	20	2,295			2,238
Work in progress ⁽¹⁾	N/A			1,052			768
Total cost				39,114			45,517
Accumulated depreciation				(23,287		)	(28,049		)
				$	15,827		$	17,468

⁽¹⁾Work in progress primarily includes production tooling and equipment and information technology assets.

Depreciation expense was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Depreciation expense	$	5,387	$	4,320	$	2,558

Goodwill

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

GOODWILL

The rollforward of goodwill was as follows (in thousands):



	Direct			Retail			Total
Balance, January 1, 2015	$	2,520		$	—		$	2,520
Currency exchange rate adjustment	(407		)	—			(407		)
Business acquisition (Note 2)	—			58,357			58,357
Balance, December 31, 2015	2,113			58,357			60,470
Currency exchange rate adjustment	67			3			70
Measurement period adjustments (Note 2)	—			1,348			1,348
Balance, December 31, 2016	2,180			59,708			61,888
Currency exchange rate adjustment	155			(13		)	142
Balance, December 31, 2017	$	2,335		$	59,695		$	62,030

We performed our annual goodwill impairment evaluations during the fourth quarters of 2017, 2016, and 2015. Our 2017 and 2015 evaluations were performed using a qualitative assessment of each reporting unit and determined that it was not more-likely-than-not that the fair value of any reporting unit was less than its carrying amount. Our 2016 test was conducted using a quantitative valuation due to our acquisition of Octane on December 31, 2015. We determined no impairments of goodwill were indicated in 2017, 2016 and 2015.

Other Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets

OTHER INTANGIBLE ASSETS

Other intangible assets consisted of the following (in thousands):



	Estimated Useful Life (in years)			As of December 31,
	Estimated Useful Life (in years)			2017			2016
Indefinite-lived trademarks⁽¹⁾	N/A			$	23,252		$	32,052
Definite-lived trademarks	10	to	15	2,600			2,600
Patents	8	to	24	15,187			31,487
Customer relationships	10	to	15	24,700			24,700
				65,739			90,839
Accumulated amortization - definite-lived intangible assets				(7,996		)	(21,039		)
				$	57,743		$	69,800

⁽¹⁾During the fourth quarter of 2017, we identified impairment indicators in our Octane Fitness brand name originally acquired through the Octane Fitness acquisition on December 31, 2015. Ongoing weakness in the specialty retail channel, as a result of retailer consolidation, has had a negative impact on Octane branded sales and projected growth trends. We utilized the relief-from-royalty method to quantify the impairment, resulting in an $8.8 million non-cash impairment charge for 2017.

Amortization expense was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Amortization expense	$	3,256	$	3,554	$	854

Future amortization of definite-lived intangible assets is as follows (in thousands):



2018	$	3,164
2019	3,134
2020	3,108
2021	3,078
2022	3,078
Thereafter	18,929
	$	34,491

Borrowings

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Borrowings

BORROWINGS

Term Loan and Line of Credit

On December 31, 2015 we entered into an amendment (the “Amendment”) to our existing Credit Agreement, dated December 5, 2014, with JPMorgan Chase Bank, N.A. (“Chase Bank”) that provided for an $80 million term loan to finance the acquisition described in Note 2, Business Acquisition, above (the “Term Loan”). The Term Loan and our existing $20 million revolving line of credit with Chase Bank are secured by substantially all of the assets of Nautilus. The Term Loan matures on December 31, 2020. The Amendment also extended the maturity date of our existing revolving line of credit to December 31, 2020.

The Credit Agreement, as amended, contains customary covenants, including minimum fixed charge coverage ratio and funded debt to EBITDA ratio, and limitations on capital expenditures, mergers and acquisitions, indebtedness, liens, dispositions, dividends and investments. The Credit Agreement also contains customary events of default. Upon an event of default, the lender may terminate its credit line commitment, accelerate all outstanding obligations and exercise its remedies under the continuing security agreement.

Borrowing availability under the Credit Agreement is subject to our compliance with certain financial and operating covenants at the time borrowings are requested. Letters of credit under the Credit Agreement are treated as a reduction of the available borrowing amount and are subject to covenant testing.

The interest rate applicable to the Term Loan and to each advance under the revolving line of credit is based on either Chase Bank's floating prime rate or adjusted LIBOR, plus an applicable margin. As of December 31, 2017, our borrowing rate for the Term Loan and line of credit advances was 2.35%.

As of December 31, 2017, we had outstanding borrowings of $48.0 million on our term loan and no letters of credit issued under the Credit Agreement. As of December 31, 2017, we were in compliance with the financial covenants of the Credit Agreement, and $20.0 million was available for borrowing under the line of credit.

Principal maturities of our Term Loan over the next five years are as follows (in thousands):



2018	$	16,000
2019	16,000
2020	16,000
	$	48,000

Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

Income Tax Expense

Income from continuing operations before income taxes was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
U.S.	$	34,259	$	50,651	$	39,242
Non-U.S.	1,446		930		780
	$	35,705	$	51,581	$	40,022

Income tax expense (benefit) from continuing operations was as follows (in thousands):



	Year Ended December 31,
	2017			2016		2015
Current:
U.S. federal	$	14,409		$	6,765	$	858
U.S. state	1,887			318		171
Non-U.S.	330			118		355
Total current	16,626			7,201		1,384
Deferred:
U.S. federal	(9,418		)	8,130		11,324
U.S. state	819			1,037		573
Non-U.S.	53			112		(62		)
Total deferred	(8,546		)	9,279		11,835
	$	8,080		$	16,480	$	13,219

Following is a reconciliation of the U.S. statutory federal income tax rate with our effective income tax rate for continuing operations:



	Year Ended December 31,
	2017		2016		2015
U.S. statutory income tax rate	35.0	%	35.0	%	35.0	%
State tax, net of U.S. federal tax benefit	5.0		2.4		2.6
Non-U.S. income taxes	(0.1	)	0.3		(0.1	)
Nondeductible operating expenses	0.8		0.3		0.8
Research and development credit	(1.5	)	(1.0	)	(0.6	)
Change in deferred tax measurement rate⁽¹⁾	(15.3	)	(0.1	)	—
Change in uncertain tax positions	0.8		(5.1	)	1.1
Excess tax benefits from stock plans	(2.1	)	—		—
Change in valuation allowance	0.1		0.2		(5.8	)
Other	(0.1	)	(0.1	)	—
Effective income tax rate	22.6	%	31.9	%	33.0	%

⁽¹⁾ Effective income tax rate for 2017 includes impacts related to the Tax Cuts and Jobs Act (the “TCJ Act”).

Deferred Income Taxes

Individually significant components of deferred income tax assets and liabilities were as follows (in thousands):



	As of December 31,
	2017			2016
Deferred income tax assets:
Accrued liabilities	$	3,000		$	5,089
Allowance for doubtful accounts	12			40
Inventory valuation	254			199
Capitalized indirect inventory costs	383			497
Stock-based compensation expense	897			1,346
Deferred rent	588			865
Accrued royalty	—			429
Net operating loss carryforward	1,715			2,377
Basis difference on long-lived assets	548			1,052
Credit carryforward	634			615
Other	179			140
Gross deferred income tax assets	8,210			12,649
Valuation allowance	(914		)	(886		)
Deferred income tax assets, net of valuation allowance	7,296			11,763
Deferred income tax liabilities:
Prepaid advertising	(370		)	(1,302		)
Other prepaids	(610		)	(744		)
Basis difference of long-lived assets	(14,856		)	(26,215		)
Undistributed earnings of foreign subsidiaries	—			(457		)
Other	(18		)	(25		)
Deferred income tax liabilities	(15,854		)	(28,743		)
Net deferred income tax liabilities	$	(8,558	)	$	(16,980	)

Our net deferred income tax assets (liabilities) were recorded on our consolidated balance sheets as follows (in thousands):



	As of December 31,
	2017			2016
Deferred income tax assets, non-current	—			11
Deferred income tax liabilities, non-current	(8,558		)	(16,991		)
Net deferred income tax liabilities	$	(8,558	)	$	(16,980	)

On December 22, 2017, the TCJ Act was enacted into law. The TCJ Act provides for significant changes to the U.S. Internal Revenue Code of 1986 that impact corporate taxation requirements, such as the reduction of the federal tax rate for corporations from 35% to 21%, changes or limitations to certain tax deductions, implementing the territorial tax system and imposing a repatriation tax on deemed repatriated earnings of foreign subsidiaries.

We made an effort to reasonably estimate the impact of the TCJ Act, however, due to the complexities and the timing of the enactment, our accounting under ASC 740 for certain income tax effects of the TCJ Act is provisional as of December 31, 2017. We reported, as provisional amounts, the specific effect of those items for which the accounting is not complete but for which we determined a reasonable estimate. These provisional amounts are subject to adjustment during a “measurement period” until the accounting under ASC 740 is complete.

Further, on December 22, 2017, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete the accounting for certain income tax effects of the TCJ Act. In accordance with SAB 118, we have calculated and recorded a $5.6 million income tax benefit in the fourth quarter of 2017 related to the remeasurement of certain deferred tax assets

and liabilities. Additional work is necessary for a more detailed analysis of our deferred tax assets and liabilities. Any subsequent adjustment to these amounts will be recorded to current tax expense in the quarter of 2018 when the analysis is complete.

We account for income taxes based on the asset and liability method, whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. We have recorded a valuation allowance to reduce our deferred income tax assets to the amount we believe is more likely than not to be realized. Evaluating the need for, and amount of, a valuation allowance for deferred tax assets often requires significant judgment and extensive analysis of all available evidence on a jurisdiction-by-jurisdiction basis. Such judgments require us to interpret existing tax law and other published guidance as applied to our circumstances. As part of this assessment, we consider both positive and negative evidence. The weight given to the potential effect of positive and negative evidence must be commensurate with the extent to which the strength of the evidence can be objectively verified.

As of December 31, 2017, we had a valuation allowance against net deferred income tax assets of $0.9 million. Of the remaining valuation allowance, $0.7 million primarily relates to domestic state tax credit carryforwards as we currently do not anticipate generating income of appropriate character to utilize those credits. The remainder of $0.2 million relates to foreign net operating loss carryforwards. Should it be determined in the future that it is more likely than not that our domestic deferred income tax assets will be realized, an additional valuation allowance would be released during the period in which such an assessment is made. There have been no material changes to our foreign operations since December 31, 2016, and, accordingly, we maintain our existing valuation allowance on foreign deferred income tax assets in such jurisdictions at December 31, 2017.

Income Tax Carryforwards

As of December 31, 2017, we had the following income tax carryforwards (in millions):



	Amount		Expires in
Net operating loss carryforwards
U.S. state	$	32.0	2018 - 2035
China	$	0.8	2020 - 2022
Income tax credit carryforwards
U.S. state	$	0.9	2018 - 2031

The timing and manner in which we are permitted to utilize our net operating loss carryforwards may be limited by Internal Revenue Code Section 382, Limitation on Net Operating Loss Carry-forwards and Certain Built-in-Losses Following Ownership Change.

Unrecognized Tax Benefits

Following is a reconciliation of gross unrecognized tax benefits from uncertain tax positions, excluding the impact of penalties and interest (in thousands):



	Year Ended December 31,
	2017			2016			2015
Balance, January 1	$	1,970		$	2,519		$	2,768
Additions for tax positions taken in prior years	38			21			1
Reductions for tax positions taken in prior years	(5		)	(523		)	(426		)
Additions for tax positions related to the current year	211			83			43
Lapses of statutes of limitations	(11		)	(130		)	—
Other	(9		)	—			133
Balance, December 31	$	2,194		$	1,970		$	2,519

Of the $2.2 million of gross unrecognized tax benefits from uncertain tax positions outstanding as of December 31, 2017, $2.0 million would affect our effective tax rate if recognized.

We recorded tax-related interest and penalty expense (benefit) of $0.3 million, $(1.9) million and $0.5 million in 2017, 2016 and 2015, respectively. We had a cumulative liability for interest and penalties related to uncertain tax positions as of December 31, 2017 and 2016 of $1.0 million and $0.7 million, respectively.

Our U.S. federal income tax returns for 2009 through 2017 are open to review by the U.S. Internal Revenue Service. Our state income tax returns for 2007 through 2017 are open to review, depending on the respective statute of limitation in each state. In addition, we file income tax returns in several non-U.S. jurisdictions with varying statutes of limitation.

As of December 31, 2017, we believe it is reasonably likely that, within the next 12 months, $0.8 million of the previously unrecognized tax benefits related to certain non-U.S. filing positions may be recognized.

Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

Accumulated other comprehensive income (loss), net of applicable taxes, reported on our consolidated balance sheets consists of unrealized holding gains and losses on available-for-sale securities, effective portions of gains and losses of derivative securities designated as cash flow hedges, and foreign currency translation adjustments. The following table sets forth the changes in accumulated other comprehensive income (loss), net of tax (in thousands) for the periods presented:



	Unrealized Gain (Loss) on Available-for-Sale Securities			Gain (loss) on Derivative Securities			Foreign Currency Translation Adjustments			Accumulated Other Comprehensive Income (Loss)
Balance, January 1, 2015	$	(18	)	$	—		$	(290	)	$	(308	)
Current period other comprehensive income (loss)	2			—			(1,021		)	(1,019		)
Balance, December 31, 2015	(16		)	—			(1,311		)	(1,327		)
Current period other comprehensive income (loss) before reclassifications	8			(450		)	126			(316		)
Reclassification of amounts to earnings	—			426			—			426
Net other comprehensive income (loss) during period	8			(24		)	126			110
Balance, December 31, 2016	(8		)	(24		)	(1,185		)	(1,217		)
Current period other comprehensive income (loss) before reclassifications	(56		)	80			774			798
Reclassification of amounts to earnings	—			160			—			160
Net other comprehensive income (loss) during period	(56		)	240			774			958
Balance, December 31, 2017	$	(64	)	$	216		$	(411	)	$	(259	)

Stock-Based Compensation

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION

2015 Long-Term Incentive Plan

On April 28, 2015, Nautilus shareholders approved our 2015 Long-Term Incentive Plan (the “2015 Plan”), which replaced our 2005 Long-Term Incentive Plan that expired in 2015. The 2015 Plan is administered by the Compensation Committee of the Board of Directors and authorizes us to grant various types of stock-based awards including: stock options, stock appreciation rights, RSAs, RSUs, and PSUs. Stock options granted under the 2015 Plan shall not have an exercise price less than the fair market value of our common stock on the date of the grant. The exercise price of a stock option or stock appreciation right may not be reduced without shareholder approval. Stock options generally vest over periods of three or four years of continuous service, commencing on the date of grant. Stock options granted under the 2015 Plan have a seven-year contractual term.

Upon adoption, there were approximately 4.8 million shares available for issuance under the 2015 Plan. The number of shares available for issuance upon adoption of the 2015 Plan included new shares approved, plus any shares of common stock which were previously reserved for issuance under our preceding plan and were not subject to grant as of April 28, 2015, or as to which the stock-based compensation award is forfeited on or after April 28, 2015. The number of shares available for issuance is reduced by (i) two shares for each share delivered in settlement of any stock appreciation rights, RSA, RSU or PSU awards, and (ii) one share for each share delivered in settlement of a stock option award. In no event shall more than 1.0 million aggregate shares of common stock subject to stock options, stock appreciation rights, RSA, RSU or PSU awards be granted to any one participant in any one year under the 2015 Plan. At December 31, 2017, we had 4.2 million shares available for future grant under our 2015 Plan, and a total of 4.9 million shares of our common stock are reserved for future issuance pursuant to awards currently outstanding under the 2015 Plan and our previous plan combined.

Stock Option Activity

Stock option activity was as follows (shares in thousands):



	Options Outstanding		Weighted- Average Exercise Price
Outstanding at December 31, 2016	433		$	5.03
Forfeited, canceled or expired	(1	)	15.58
Exercised	(135	)	4.15
Outstanding at December 31, 2017	297		$	5.37

Certain information regarding options outstanding at December 31, 2017 was as follows:



	Options Outstanding		Options Exercisable		Options Vested and Expected to Vest
Number (in thousands)	297		291		297
Weighted-average exercise price	$	5.37	$	5.19	$	5.37
Aggregate intrinsic value (in thousands)	$	2,405	$	2,401	$	2,405
Weighted average remaining contractual term (in years)	2.1		2.0		2.1

RSA Activity

Compensation expense for RSAs is recognized over the estimated vesting period. Following is a summary of RSA activity (shares in thousands):



	RSAs Outstanding		Weighted- Average Grant Date Fair Value per Share
Outstanding at December 31, 2016	44		$	16.31
Granted	17		17.60
Vested	(14	)	17.91
Outstanding at December 31, 2017	47		$	16.28

RSU Activity

Compensation expense for RSUs is recognized over the estimated vesting period. Following is a summary of RSU activity (shares in thousands):



	RSUs Outstanding		Weighted- Average Grant Date Fair Value per Share
Outstanding at December 31, 2016	109		$	18.17
Granted	108		16.94
Forfeited, canceled or expired	(24	)	17.78
Vested	(2	)	19.07
Outstanding at December 31, 2017	191		$	17.64

PSU Activity

Compensation expense for PSUs is recognized over the estimated requisite service period based on the number of PSUs ultimately expected to vest.

In February 2014, we granted PSU awards to certain of our executive officers covering a total of 82,494 shares of our common stock. The PSUs vested in 2017 based on achievement of goals established for operating income and revenue growth for the three-year performance period ended 2016. These awards vested in full in 2017 at the 150% maximum achievement for a total of 123,739 shares.

In April and September 2015, we granted PSU awards to certain of our executive officers and management team covering a total of 56,820 shares of our common stock. The PSUs vest based on achievement of goals established for certain operating income and return on asset criteria for a three-year performance period. The number of shares vesting under the PSU awards following conclusion of the performance period will be determined based on the level at which the financial goals are achieved. The number of shares vesting can range from 60% of the PSU awards if minimum thresholds are achieved to a maximum of 150%. These awards are expected to vest at approximately 115% achievement, net of any forfeitures. As of December 31, 2017, approximately 44,900 PSU shares remained, net of actual forfeitures to date.

In December 2015, we granted PSU awards to a certain executive officer and management team personnel covering a total of 117,230 shares of our common stock. The PSUs vest based on achievement of certain operating income and operating margin goals for a three-year performance period. The number of shares vesting under the PSU awards following conclusion of the performance period will be determined based on the level at which the financial goals are achieved. As of December 31, 2017, approximately 13,600 PSU shares remained, net of actual forfeitures to date. These awards were authorized for replacement by our Board of Directors during 2017 and will be processed in 2018.

In February 2016, we granted PSU awards to certain of our executive officers and management team covering a total of 54,818 shares of our common stock. The PSUs vest based on achievement of goals established for growth in operating income as a percentage of net revenue and return on invested capital over a three-year performance period. The number of shares that ultimately vest following conclusion of the performance period will be determined based on the level at which the financial goals are achieved. The number of shares vesting can range from 60% of the PSU awards if minimum thresholds are achieved to a maximum of 150%. As of December 31, 2017, approximately 48,600 PSU shares remained, net of actual forfeitures to date.

In February 2017, we granted PSU awards to certain of our executive officers and management team covering a total of 72,017 shares of our common stock. The PSUs vest based on achievement of goals established for growth in operating income as a percentage of net revenue and return on invested capital over a three-year performance period. The number of shares that ultimately vest following conclusion of the performance period will be determined based on the level at which the financial goals are achieved. The number of shares vesting can range from 60% of the PSU awards if minimum thresholds are achieved to a maximum of 150%. As of December 31, 2017, approximately 65,100 PSU shares remained, net of actual forfeitures to date.

Following is a summary of PSU activity (shares in thousands):



	PSUs Outstanding		Weighted- Average Grant Date Fair Value per Share
Outstanding at December 31, 2016	264		$	14.66
Granted and additional goal shares awarded	113		13.84
Forfeited, canceled or expired	(81	)	16.99
Vested	(124	)	8.23
Outstanding at December 31, 2017	172		$	17.65

Stock-Based Compensation

Stock-based compensation expense, primarily included in general and administrative expense, was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Stock options	$	84	$	389	$	327
RSAs	287		168		—
RSUs	954		734		544
PSUs	408		1,211		575
ESPP	123		111		38
	$	1,856	$	2,613	$	1,484

Certain other information regarding our stock-based compensation was as follows (in thousands, except per share amounts):



	Year Ended December 31,
	2017		2016		2015
Weighted average grant-date per share fair value of stock options granted	$	—	$	—	$	8.94
Total intrinsic value of stock options exercised	1,522		1,221		4,142
Fair value of RSUs vested	28		311		673
Fair value of PSUs vested	2,036		574		1,454

As of December 31, 2017, unrecognized compensation expense for outstanding, but unvested stock-based awards was $2.6 million, which is expected to be recognized over a weighted average period of 0.4 to 1.3 years.

Employee Stock Purchase Plan

On April 28, 2015, our shareholders approved our Employee Stock Purchase Plan (the “ESPP”). The ESPP is administered by the Compensation Committee of the Board of Directors and provides eligible employees with an opportunity to purchase shares of our common stock at a discount using payroll deductions. The ESPP authorizes the issuance of up to 0.5 million shares of our common stock, subject to adjustment as provided in the ESPP for stock splits, stock dividends, recapitalizations and other similar events.

Pursuant to the ESPP, and subject to certain limitations specified therein, eligible employees may elect to purchase shares of our common stock in one or more of a series of offerings conducted pursuant to the procedures set forth in the ESPP at a purchase price equal to 90% of the lower of the fair market value of the common stock on the first trading day of the offering period or on the last day of the offering period. Offering periods commence on May 15 and November 15 of each year and are six-months in duration, with the exception of the first offering period in 2015, which was a four-month offering. Purchases under the ESPP may be made exclusively through payroll deductions.

Persons eligible to participate in the ESPP generally include employees who have been employed for at least 12 months prior to the applicable offering date and who, immediately upon purchasing shares under the ESPP, would own directly or indirectly, an aggregate of less than 5% of the total combined voting power or value of all outstanding shares of our common stock.

ESPP activity was as follows (shares in thousands):



	Shares Available for Issuance		Weighted- Average Purchase Price		Weighted-Average Discount per Share
Balance at December 31, 2016	469
Employee shares purchased	(37	)	$	13.20	$	2.19
Balance at December 31, 2017	432

Assumptions used in calculating the fair value of stock option grants and employee stock purchases were as follows:



	Year Ended December 31,
	2017	2016	2015
	ESPP	ESPP	ESPP	Options
Dividend yield	—%	—%	—%	—%
Risk-free interest rate	0.8%	0.4%	0.1%	1.6%
Expected life (years)	N/A	N/A	N/A	4.28
Expected volatility	44%	56%	43%	71%

Dividend yield is based on our current expectation that no dividend payments will be made in future periods.

Risk-free interest rate is the U.S. Treasury zero-coupon rate, as of the grant date, for issues having a term approximately equal to the expected life of the stock option. For the ESPP, it is the U.S. Treasury six-month constant maturities rate, as of the offering date.

Expected life is the period of time over which stock options are expected to remain outstanding. We calculate expected term based on the average of the sum of the vesting periods and the full contractual term.

Expected volatility is the percentage amount by which the price of our common stock is expected to fluctuate annually during the estimated expected life for stock options. Expected price volatility is calculated using historical daily closing prices over a period matching the weighted-average expected life for stock options, as management believes such changes are the best indicator of future volatility. For the ESPP, expected volatility is the percentage amount by which the price of our common stock is expected to fluctuate semi-annually during the offering period.

Stock Repurchase Program Stock Repurchase Program

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Stock Repurchase Program

STOCK REPURCHASE PROGRAM

On November 3, 2014, our Board of Directors authorized a stock repurchase program that authorized us to repurchase up to $15.0 million of our outstanding common stock from time to time during the ensuing period of 24 months. As of November 2016, the stock repurchases under this program were completed in full and the program expired.

On May 4, 2016, our Board of Directors authorized the repurchase of up to $10.0 million of our outstanding common stock from time to time through May 4, 2018. During 2017, repurchases under this program totaled $8.1 million. As of November 2017, the stock repurchases under this program were completed in full and the program expired.

On April 25, 2017, our Board of Directors authorized a $15.0 million share repurchase program. Under this program, shares of common stock may be repurchased from time to time through April 25, 2019. Repurchases may be made in open market transactions at prevailing market prices, in privately negotiated transactions, or by other means in accordance with federal securities laws. Share repurchases are funded with existing cash balances, and the repurchased shares are retired and returned to unissued authorized shares. As of December 31, 2017, repurchases under this program totaled $3.0 million.

As of December 31, 2017, there was $12.0 million remaining available for share repurchases pursuant to the 2017 program. Repurchases for 2015 through 2017 for all programs were as follows:



Year Ended	Number of Shares	Repurchased Amount	Average Price per Share
December 31, 2015	711,708	$11,567,527	$16.25
December 31, 2016	319,805	5,390,355	16.86
December 31, 2017	788,416	11,054,983	14.02
Totals to Date	1,819,929	$28,012,865	$15.39

Segment Information

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Segment Information

SEGMENT AND ENTERPRISE-WIDE INFORMATION

In accordance with FASB ASC 280, Segment Reporting, we determined that we have two operating segments - Direct and Retail. There have been no changes in our operating segments during the year ended December 31, 2017.

We evaluate performance using several factors, of which the primary financial measures are net sales and reportable segment contribution. Contribution is the measure of profit or loss, defined as net sales less product costs and directly attributable expenses. Directly attributable expenses include selling and marketing expenses, general and administrative expenses, and research and development expenses that are directly related to segment operations. Segment assets are those directly assigned to an operating segment's operations, primarily accounts receivable, inventories, goodwill and other intangible assets. Unallocated assets primarily include cash and cash equivalents, available-for-sale securities, derivative securities, shared information technology infrastructure, distribution centers, corporate headquarters, prepaids and other current assets, deferred income tax assets and other assets. Capital expenditures directly attributable to the Direct and Retail segments were not significant in any period.

Following is summary information by reportable segment (in thousands):



	Year Ended December 31,
	2017			2016			2015
Net Sales:
Direct	$	219,440		$	225,057		$	225,595
Retail	183,875			177,920			106,195
Unallocated royalty	2,869			3,062			3,974
Consolidated net sales	$	406,184		$	406,039		$	335,764
Contribution:
Direct	$	34,900		$	43,215		$	39,940
Retail	27,495			29,451			12,850
Unallocated royalty	2,852			3,018			3,974
Consolidated contribution	$	65,247		$	75,684		$	56,764

Reconciliation of consolidated contribution to income from continuing operations:
Consolidated contribution	$	65,247		$	75,684		$	56,764
Amounts not directly related to segments:
Operating expenses	(28,944		)	(22,290		)	(16,493		)
Other expense, net	(598		)	(1,813		)	(249		)
Income tax expense	8,080			16,480			13,219
Income from continuing operations	$	27,625		$	35,101		$	26,803

Depreciation and amortization expense:
Direct	$	1,666		$	1,944		$	868
Retail	4,606			4,775			757
Unallocated corporate	2,371			1,155			1,787
Total depreciation and amortization expense	$	8,643		$	7,874		$	3,412

	As of December 31,
Assets:	2017			2016
Direct	$	40,532		$	37,388
Retail	192,064			206,580
Unallocated corporate	92,180			89,098
Total assets	$	324,776		$	333,066

Net sales by geographic area were as follows:



	Year Ended December 31,
	2017		2016		2015
U.S.	$	352,703	$	353,893	$	295,366
Canada	25,589		26,005		33,230
All other	27,892		26,141		7,168
	$	406,184	$	406,039	$	335,764

There are no material long-lived assets held outside of the U.S.

In 2017, 2016 and 2015, Amazon.com accounted for 11.9%, 11.3% and 11.1%, respectively, of our net sales.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Operating Leases

We lease property and equipment under non-cancellable operating leases which, in the aggregate, extend through 2025. Many of these leases contain renewal options and provide for rent escalations and payment of real estate taxes, maintenance, insurance and certain other operating expenses of the properties. Rent expense under all operating leases was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Rent expense	$	6,095	$	6,561	$	5,033

As of December 31, 2017, future minimum lease payments under non-cancellable leases, reduced for sublease income, were as follows (in thousands):



2018	$	5,016
2019	5,035
2020	4,983
2021	4,021
2022	2,703
Thereafter	4,353
	$	26,111

Guarantees, Commitments and Off-Balance Sheet Arrangements

We have long lead times for inventory purchases and, therefore, must secure factory capacity from our vendors in advance. As of December 31, 2017, we had approximately $19.0 million in non-cancelable market-based purchase obligations, primarily for inventory purchases expected to be received within the next twelve months. Purchase obligations can vary from quarter-to-quarter and versus the same period in prior years due to a number of factors, including the amount of products that are shipped directly to Retail customer warehouses versus through Nautilus warehouses. As of December 31, 2017, we had no outstanding letters of credit with any of our vendors.

In the ordinary course of business, we enter into agreements that require us to indemnify counterparties against third-party claims. These may include: agreements with vendors and suppliers, under which we may indemnify them against claims arising from use of their products or services; agreements with customers, under which we may indemnify them against claims arising from their use or sale of our products; real estate and equipment leases, under which we may indemnify lessors against third-party claims relating to the use of their property; agreements with licensees or licensors, under which we may indemnify the licensee or licensor against claims arising from their use of our intellectual property or our use of their intellectual property; and agreements with parties to debt arrangements, under which we may indemnify them against claims relating to their participation in the transactions.

The nature and terms of these indemnification obligations vary from contract to contract, and generally a maximum obligation is not stated within the agreements. We hold insurance policies that mitigate potential losses arising from certain types of indemnification obligations. Management does not deem these obligations to be significant to our financial position, results of operations or cash flows and, therefore, no related liabilities were recorded as of December 31, 2017.

Legal Matters

From time to time, in the ordinary course of business, we may be involved in various claims, lawsuits and other proceedings. These legal and tax proceedings involve uncertainty as to the eventual outcomes and losses which may be realized when one or more future events occur or fail to occur.

Litigation and jury verdicts are, to some degree, inherently unpredictable, and although we have determined that a loss is not probable in connection with any current legal proceeding, it is reasonably possible that a loss may be incurred in connection with proceedings to which we are a party. Assessment of whether incurrence of a loss is probable, or a reasonable possibility, in connection with a particular proceeding, and estimation of the loss, or a range of loss, involves complex judgments and numerous uncertainties. Management is unable to estimate a range of reasonably possible losses related to litigation in which the damages sought are indeterminate, or the legal and factual basis for the relevant claims have not been developed with specificity. As such, zero liability is recorded as of December 31, 2017.

We regularly monitor our estimated exposure to these contingencies and, as additional information becomes known, may change our estimates accordingly. We evaluate, on a quarterly basis, developments in legal proceedings, investigations or claims that could affect the amount of any accrual, as well as any developments that would make a loss probable or reasonably possible, and whether the amount of a probable or reasonably possible loss is estimable. Among other factors, we evaluate the advice of internal and external counsel, the outcomes from similar litigation, current status of the lawsuits (including settlement initiatives), legislative developments and other factors. Due to the numerous variables associated with these judgments and assumptions, both the precision and reliability of the resulting estimates of the related loss contingencies are subject to substantial uncertainties.

As of the date of filing of this Annual Report on Form 10-K, we were not involved in any material legal proceedings.

Supplementary Information - Quarterly Results of Operations (unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Supplementary Information - Quarterly Results of Operations Unaudited

SUPPLEMENTARY INFORMATION - QUARTERLY RESULTS OF OPERATIONS (unaudited)

The following table summarizes our unaudited quarterly financial data for 2017 and 2016 (in thousands, except per share amounts):



	Quarter Ended
	March 31			June 30			September 30			December 31			Total
2017
Net sales	$	113,252		$	77,029		$	88,132		$	127,771		$	406,184
Gross profit	61,745			38,378			41,315			62,444			203,882
Operating income⁽¹⁾	12,683			3,849			13,365			6,406			36,303
Income from continuing operations⁽²⁾	8,185			2,566			8,342			8,532			27,625
Loss from discontinued operations⁽³⁾	(1,092		)	(77		)	(101		)	(88		)	(1,358		)
Net income	7,093			2,489			8,241			8,444			26,267
Net income per share:
Basic	$	0.23		$	0.08		$	0.27		$	0.28		$	0.86
Diluted	0.23			0.08			0.27			0.27			0.85

2016
Net sales	$	120,928		$	78,529		$	80,818		$	125,764		$	406,039
Gross profit	66,344			41,862			39,217			64,102			211,525
Operating income	19,300			6,573			8,211			19,310			53,394
Income from continuing operations⁽⁴⁾	11,586			3,696			7,845			11,974			35,101
Loss from discontinued operations	(142		)	(166		)	(251		)	(364		)	(923		)
Net income	11,444			3,530			7,594			11,610			34,178
Net income per share:
Basic	$	0.37		$	0.11		$	0.24		$	0.38		$	1.10
Diluted	0.37			0.11			0.24			0.37			1.09

⁽¹⁾ Operating income for the quarter ended December 31, 2017 included an $8.8 million non-cash asset impairment charge related to the Octane Fitness brand name.

⁽²⁾ Income from continuing operations for the quarter ended December 31, 2017 included a non-recurring tax benefit of $5.6 million related to the change in U.S. tax law that resulted in the reassessment of certain deferred tax assets and liabilities.

⁽³⁾Loss from discontinued operations for the quarter ended March 31, 2017 included a $1.2 million expense related to a lawsuit settlement with Biosig Instruments, Inc.

⁽⁴⁾Income from continuing operations for the quarter ended September 30, 2016 included a non-recurring tax benefit of $2.7 million related to the release of previously unrecognized tax benefits associated with certain non-U.S. filing positions, which resulted from completing the deregistration of a certain foreign entity.

Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENT On February 21, 2018, our Board of Directors authorized an additional $15.0 million share repurchase program. Under the new program, shares of our common stock may be repurchased from time to time through February 21, 2020. Repurchases may be made in open market transactions at prevailing prices, in privately negotiated transactions, or by other means in accordance with federal securities laws. Share repurchases will be funded from existing cash balances, and repurchased shares will be retired and returned to unissued authorized shares. To date, we have not repurchased any shares under the new $15.0 million program.

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Basis of Presentation

Basis of PresentationThe accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and relate to Nautilus, Inc. and its subsidiaries, all of which are wholly-owned, directly or indirectly. Intercompany transactions and balances have been eliminated in consolidation.

Discontinued Operation

Discontinued Operations

Results of operations related to the Commercial business have been presented in the consolidated financial statements as discontinued operations for all periods presented.

Critical Accounting Estimates


•	Sales discounts and allowances;


•	Goodwill and other long-term assets valuation;


•	Product warranty obligations; and


•	Unrecognized tax benefits.

Actual results could differ from our estimates.

Concentrations

Cash and Cash Equivalents

Cash and Cash Equivalents All highly liquid investments with original maturities of three months or less at purchase are considered to be cash equivalents.

Available-For-Sale Securities

For additional information, refer to Note 4, Fair Value Measurements.

Derivative Securities

Trade Receivables

Trade ReceivablesAccounts receivable primarily consists of trade receivables due from our Retail segment customers. We determine an allowance for doubtful accounts based on historical customer experience and other currently available evidence. When a specific account is deemed uncollectible, the account is written off against the allowance.

Inventories

Inventories Inventories are stated at the lower of cost and net realizable value ("NRV"), with cost determined based on the first-in, first-out method. We establish inventory allowances for excess, slow-moving and obsolete inventory based on inventory levels, expected product life and forecasted sales. Inventories are written down to NRV based on historical demand, competitive factors, changes in technology and product lifecycles.

Property, plant and equipment

Property, Plant and Equipment

Goodwill

Other intangible assets

Other Intangible Assets

Impairment of long-lived assets

Impairment of Long-Lived Assets Long-lived assets, including property, plant and equipment and definite-lived intangible assets, are evaluated for impairment when events or circumstances indicate the carrying value may be impaired. When such an event or condition occurs, we estimate the future undiscounted cash flows to be derived from the use and eventual disposition of the asset to determine whether a potential impairment exists. If the carrying value exceeds estimated future undiscounted cash flows, we record impairment expense to reduce the carrying value of the asset to its estimated fair value. No impairment charges were recorded in 2017, 2016 and 2015.

Share Repurchases

Revenue recognition

Revenue Recognition

Sales discounts and allowances

Sales Discounts and Returns Allowance Product sales and shipping revenues are reported net of promotional discounts and return allowances. We estimate the revenue impact of retail sales incentive programs based on the planned duration of the program and historical experience. If the amount of sales incentives is reasonably estimable, the impact of such incentives is recorded at the later of the time the customer is notified of the sales incentive or the time of the sale. We estimate our liability for product returns based on historical experience and record the expected obligation as a reduction of revenue. If actual return costs differ from previous estimates, the amount of the liability and corresponding revenue are adjusted in the period in which such costs occur. Activity in our sales discounts and returns allowance was as follows (in thousands):

Taxes collected from customers and remitted to governmental authorities

Taxes Collected from Customers and Remitted to Governmental AuthoritiesTaxes collected from customers and remitted to governmental authorities are recorded on a net basis and excluded from net sales.

Shipping and handling fees

Shipping and Handling Fees Shipping and handling fees billed to customers are recorded net of discounts and included in both net sales and cost of sales.

Cost of sales

Cost of SalesCost of sales primarily consists of: inventory costs; royalties paid to third parties; employment and occupancy costs of warehouse and distribution facilities, including depreciation of improvements and equipment; transportation expenses; product warranty expenses; distribution information systems expenses; and allocated expenses for shared administrative functions.

Product warranty obligations

Product Warranty Obligations

Litigation and loss contingencies

Litigation and Loss Contingencies

is at least a reasonable possibility and material, then we disclose an estimate of the possible loss or range of loss, if such estimate can be made, or disclose that an estimate cannot be made.

Advertising and promotion

Advertising and Promotion We expense our advertising and promotion costs as incurred. Production costs of television advertising commercials are recorded in prepaids and other current assets until the initial broadcast, at which time such costs are expensed.

Research and development

Research and Development

Income taxes

Income Taxes

Unrecognized Tax Benefits

Foreign currency translation

Foreign Currency Translation

Fair value of financial instruments

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, trade receivables, prepaids and other current assets, trade payables and accrued liabilities approximate fair value due to their short maturities.

For additional information on financial instruments recorded at fair value on a recurring basis as of December 31, 2017 and 2016, refer to Note 4, Fair Value Measurements.

Share-Based Compensation

Stock-Based Compensation

Shares to be issued upon the exercise of stock options or the vesting of stock awards will come from newly issued shares.

Income Per Share Amounts

Income Per Share AmountsBasic income per share amounts were computed using the weighted average number of common shares outstanding. Diluted income per share amounts were calculated using the number of basic weighted average shares outstanding increased by dilutive potential common shares related to stock-based awards, as determined by the treasury stock method.

New Accounting Pronouncements

Newly-Adopted Pronouncements

ASU 2017-04

ASU 2016-09

ASU 2015-11

Issued Not Yet Adopted Pronouncements

ASU 2017-12

ASU 2017-09

ASU 2016-15

ASU 2016-13

ASU 2016-02

ASU 2014-09

Business Acquisition (Tables)

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table summarizes the fair values of the net assets acquired and liabilities assumed as of the acquisition date, including all measurement period adjustments (in thousands):



	Final valuation at December 31, 2016
Cash	$	7,759
Accounts receivable	12,476
Inventories	13,134
Prepaid expenses	885
Deferred tax assets	1,303
Property, plant and equipment	3,372
Intangible assets	63,100
Total assets acquired	102,029

Accounts payable	6,497
Accrued liabilities	2,968
Warranty obligations	5,550
Deferred tax liabilities, non-current	21,033
Other non-current liabilities	390
Total liabilities assumed	36,438

Net identifiable assets acquired	65,591
Goodwill	59,705
Net assets acquired	$	125,296

Business Acquisition, Pro Forma Information



		(unaudited)
		Year Ended December 31,
		2016		2015
Net sales		$	406,039	$	400,078
Net income		35,683		29,352
Net income per share:
	Basic	$	1.15	$	0.94
	Diluted	1.14		0.93

Discontinued Operation (Tables)

12 Months Ended

Dec. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Operating Results of Company's Former Commercial Business

Following is a summary of certain financial information regarding our discontinued operations (in thousands):



	Year Ended December 31,
	2017			2016			2015
Loss from discontinued operations before income taxes	$	(1,713	)	$	(1,077	)	$	(601	)
Income tax benefit	(355		)	(154		)	(400		)
Total loss from discontinued operations	$	(1,358	)	$	(923	)	$	(201	)

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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+ Details

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):



	December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash Equivalents
Money market funds	$	10,946	$	—	$	—	$	10,946
Commercial paper	—		1,996		—		1,996
Total cash equivalents	10,946		1,996		—		12,942

Available-for-Sale Securities
Certificates of deposit⁽¹⁾	—		19,875		—		19,875
Corporate bonds	—		29,239		—		29,239
U.S. government bonds	—		8,189		—		8,189
Total available-for-sale securities	—		57,303		—		57,303

Derivatives
Interest rate swap contract	—		372		—		372
Foreign currency forward contracts	—		390		—		390
Total derivatives	—		762		—		762
Total assets measured at fair value	$	10,946	$	60,061	$	—	$	71,007



	December 31, 2016
	Level 1		Level 2			Level 3		Total
Assets:
Cash Equivalents
Money market funds	$	9,635	$	—		$	—	$	9,635
Commercial paper	—		3,999			—		3,999
Total cash equivalents	9,635		3,999			—		13,634

Available-for-Sale Securities
Certificates of deposit⁽¹⁾	—		22,820			—		22,820
Corporate bonds	—		6,922			—		6,922
U.S. government bonds	—		2,001			—		2,001
Total available-for-sale securities	—		31,743			—		31,743
Total assets measured at fair value	$	9,635	$	35,742		$	—	$	45,377

Liabilities:
Derivatives
Interest rate swap contract	$	—	$	(38	)	$	—	$	(38	)
Total liabilities measured at fair value	$	—	$	(38	)	$	—	$	(38	)

⁽¹⁾ All certificates of deposit are within current FDIC insurance limits.

Derivatives (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Liabilities at Fair Value

The fair value of our derivative instruments was included in our consolidated balance sheets as follows (in thousands):



	Balance Sheet Classification	As of December 31,
	Balance Sheet Classification	2017		2016
Derivative instruments designated as cash flow hedges:
Interest rate swap contract	Prepaids and other current assets	$	134	$	—
	Other assets	238		—
	Accrued liabilities	—		(38		)
		$	372	$	(38	)
Derivative instruments not designated as cash flow hedges:
Foreign currency forward contracts	Prepaids and other current assets	$	390	$	—
		$	390	$	—

Derivative Instruments, Gain (Loss)

The effect of derivative instruments on our consolidated statements of operations was as follows (in thousands):



	Statement of Operations Classification	Year Ended December 31,
	Statement of Operations Classification	2017			2016			2015
Derivative instruments designated as cash flow hedges:
Gain (loss) recognized in other comprehensive income before reclassifications	---	$	80		$	(450	)	$	—
Loss reclassified from accumulated other comprehensive income to earnings for the effective portion	Interest expense	(207		)	(626		)	—
Income tax benefit	Income tax expense	47			200			—

Derivative instruments not designated as cash flow hedges:
Loss recognized in earnings	Other, net	$	(382	)	$	—		$	—
Income tax benefit	Income tax expense	86			—			—

For additional information related to our derivatives, see Notes 4 and 15.

Trade Receivables (Tables)

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Allowance for doubtful accounts

Trade receivables, net, consisted of the following (in thousands):



	As of December 31,
	2017			2016
Trade receivables	$	42,804		$	45,628
Allowance for doubtful accounts	(119		)	(170		)
	$	42,685		$	45,458

Schedule Of Changes In Allowance For Doubtful Accounts

Changes in our allowance for doubtful trade receivables were as follows (in thousands):



	2017			2016			2015
Balance, January 1	$	170		$	918		$	108
Charges to bad debt expense	311			289			786
Recoveries (write-offs), net	(362		)	(1,037		)	24
Balance, December 31	$	119		$	170		$	918

Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories, Net of Valuation Allowances

Our inventories consisted of the following (in thousands):



	As of December 31,
	2017		2016
Finished goods	$	48,771	$	43,130
Parts and components	4,583		3,900
	$	53,354	$	47,030

Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):



	Estimated Useful Life (in years)			As of December 31,
	Estimated Useful Life (in years)			2017			2016
Automobiles	5	to	6	$	23		$	139
Leasehold improvements	4	to	20	3,542			3,388
Computer software and equipment	3	to	7	17,024			25,899
Machinery and equipment	3	to	5	15,178			13,085
Furniture and fixtures	5	to	20	2,295			2,238
Work in progress ⁽¹⁾	N/A			1,052			768
Total cost				39,114			45,517
Accumulated depreciation				(23,287		)	(28,049		)
				$	15,827		$	17,468

⁽¹⁾Work in progress primarily includes production tooling and equipment and information technology assets.

Depreciation expense was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Depreciation expense	$	5,387	$	4,320	$	2,558

Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

The rollforward of goodwill was as follows (in thousands):



	Direct			Retail			Total
Balance, January 1, 2015	$	2,520		$	—		$	2,520
Currency exchange rate adjustment	(407		)	—			(407		)
Business acquisition (Note 2)	—			58,357			58,357
Balance, December 31, 2015	2,113			58,357			60,470
Currency exchange rate adjustment	67			3			70
Measurement period adjustments (Note 2)	—			1,348			1,348
Balance, December 31, 2016	2,180			59,708			61,888
Currency exchange rate adjustment	155			(13		)	142
Balance, December 31, 2017	$	2,335		$	59,695		$	62,030

Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets

OTHER INTANGIBLE ASSETS

Other intangible assets consisted of the following (in thousands):



	Estimated Useful Life (in years)			As of December 31,
	Estimated Useful Life (in years)			2017			2016
Indefinite-lived trademarks⁽¹⁾	N/A			$	23,252		$	32,052
Definite-lived trademarks	10	to	15	2,600			2,600
Patents	8	to	24	15,187			31,487
Customer relationships	10	to	15	24,700			24,700
				65,739			90,839
Accumulated amortization - definite-lived intangible assets				(7,996		)	(21,039		)
				$	57,743		$	69,800

Amortization expense was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Amortization expense	$	3,256	$	3,554	$	854

Future amortization of definite-lived intangible assets is as follows (in thousands):



2018	$	3,164
2019	3,134
2020	3,108
2021	3,078
2022	3,078
Thereafter	18,929
	$	34,491

Schedule of Intangible Assets and Goodwill [Table Text Block]

Other intangible assets consisted of the following (in thousands):



	Estimated Useful Life (in years)			As of December 31,
	Estimated Useful Life (in years)			2017			2016
Indefinite-lived trademarks⁽¹⁾	N/A			$	23,252		$	32,052
Definite-lived trademarks	10	to	15	2,600			2,600
Patents	8	to	24	15,187			31,487
Customer relationships	10	to	15	24,700			24,700
				65,739			90,839
Accumulated amortization - definite-lived intangible assets				(7,996		)	(21,039		)
				$	57,743		$	69,800

Amortization expense

Amortization expense was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Amortization expense	$	3,256	$	3,554	$	854

Future amortization expense

Future amortization of definite-lived intangible assets is as follows (in thousands):



2018	$	3,164
2019	3,134
2020	3,108
2021	3,078
2022	3,078
Thereafter	18,929
	$	34,491

Product Warranties (Tables)

12 Months Ended

Dec. 31, 2017

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability

Changes in our product warranty obligations were as follows (in thousands):



	2017			2016			2015
Balance, January 1	$	7,450		$	8,545		$	2,246
Accruals	3,008			2,480			2,302
Payments	(4,341		)	(3,575		)	(1,553		)
Business acquisition (Note 2)	—			—			5,550
Balance, December 31	$	6,117		$	7,450		$	8,545

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Income from continuing operations before income taxes was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
U.S.	$	34,259	$	50,651	$	39,242
Non-U.S.	1,446		930		780
	$	35,705	$	51,581	$	40,022

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax expense (benefit) from continuing operations was as follows (in thousands):



	Year Ended December 31,
	2017			2016		2015
Current:
U.S. federal	$	14,409		$	6,765	$	858
U.S. state	1,887			318		171
Non-U.S.	330			118		355
Total current	16,626			7,201		1,384
Deferred:
U.S. federal	(9,418		)	8,130		11,324
U.S. state	819			1,037		573
Non-U.S.	53			112		(62		)
Total deferred	(8,546		)	9,279		11,835
	$	8,080		$	16,480	$	13,219

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Individually significant components of deferred income tax assets and liabilities were as follows (in thousands):



	As of December 31,
	2017			2016
Deferred income tax assets:
Accrued liabilities	$	3,000		$	5,089
Allowance for doubtful accounts	12			40
Inventory valuation	254			199
Capitalized indirect inventory costs	383			497
Stock-based compensation expense	897			1,346
Deferred rent	588			865
Accrued royalty	—			429
Net operating loss carryforward	1,715			2,377
Basis difference on long-lived assets	548			1,052
Credit carryforward	634			615
Other	179			140
Gross deferred income tax assets	8,210			12,649
Valuation allowance	(914		)	(886		)
Deferred income tax assets, net of valuation allowance	7,296			11,763
Deferred income tax liabilities:
Prepaid advertising	(370		)	(1,302		)
Other prepaids	(610		)	(744		)
Basis difference of long-lived assets	(14,856		)	(26,215		)
Undistributed earnings of foreign subsidiaries	—			(457		)
Other	(18		)	(25		)
Deferred income tax liabilities	(15,854		)	(28,743		)
Net deferred income tax liabilities	$	(8,558	)	$	(16,980	)

Our net deferred income tax assets (liabilities) were recorded on our consolidated balance sheets as follows (in thousands):



	As of December 31,
	2017			2016
Deferred income tax assets, non-current	—			11
Deferred income tax liabilities, non-current	(8,558		)	(16,991		)
Net deferred income tax liabilities	$	(8,558	)	$	(16,980	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Following is a reconciliation of the U.S. statutory federal income tax rate with our effective income tax rate for continuing operations:



	Year Ended December 31,
	2017		2016		2015
U.S. statutory income tax rate	35.0	%	35.0	%	35.0	%
State tax, net of U.S. federal tax benefit	5.0		2.4		2.6
Non-U.S. income taxes	(0.1	)	0.3		(0.1	)
Nondeductible operating expenses	0.8		0.3		0.8
Research and development credit	(1.5	)	(1.0	)	(0.6	)
Change in deferred tax measurement rate⁽¹⁾	(15.3	)	(0.1	)	—
Change in uncertain tax positions	0.8		(5.1	)	1.1
Excess tax benefits from stock plans	(2.1	)	—		—
Change in valuation allowance	0.1		0.2		(5.8	)
Other	(0.1	)	(0.1	)	—
Effective income tax rate	22.6	%	31.9	%	33.0	%

⁽¹⁾ Effective income tax rate for 2017 includes impacts related to the Tax Cuts and Jobs Act (the “TCJ Act”).

Summary of Income Tax Carryforwards [Table Text Block]

As of December 31, 2017, we had the following income tax carryforwards (in millions):



	Amount		Expires in
Net operating loss carryforwards
U.S. state	$	32.0	2018 - 2035
China	$	0.8	2020 - 2022
Income tax credit carryforwards
U.S. state	$	0.9	2018 - 2031

Schedule of Reconciliatin of Gross Unrecognized Tax Benefits From Uncertain Tax Positions Roll Forward [Table Text Block]

Following is a reconciliation of gross unrecognized tax benefits from uncertain tax positions, excluding the impact of penalties and interest (in thousands):



	Year Ended December 31,
	2017			2016			2015
Balance, January 1	$	1,970		$	2,519		$	2,768
Additions for tax positions taken in prior years	38			21			1
Reductions for tax positions taken in prior years	(5		)	(523		)	(426		)
Additions for tax positions related to the current year	211			83			43
Lapses of statutes of limitations	(11		)	(130		)	—
Other	(9		)	—			133
Balance, December 31	$	2,194		$	1,970		$	2,519

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table sets forth the changes in accumulated other comprehensive income (loss), net of tax (in thousands) for the periods presented:



	Unrealized Gain (Loss) on Available-for-Sale Securities			Gain (loss) on Derivative Securities			Foreign Currency Translation Adjustments			Accumulated Other Comprehensive Income (Loss)
Balance, January 1, 2015	$	(18	)	$	—		$	(290	)	$	(308	)
Current period other comprehensive income (loss)	2			—			(1,021		)	(1,019		)
Balance, December 31, 2015	(16		)	—			(1,311		)	(1,327		)
Current period other comprehensive income (loss) before reclassifications	8			(450		)	126			(316		)
Reclassification of amounts to earnings	—			426			—			426
Net other comprehensive income (loss) during period	8			(24		)	126			110
Balance, December 31, 2016	(8		)	(24		)	(1,185		)	(1,217		)
Current period other comprehensive income (loss) before reclassifications	(56		)	80			774			798
Reclassification of amounts to earnings	—			160			—			160
Net other comprehensive income (loss) during period	(56		)	240			774			958
Balance, December 31, 2017	$	(64	)	$	216		$	(411	)	$	(259	)

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Stock option activity

Stock option activity was as follows (shares in thousands):



	Options Outstanding		Weighted- Average Exercise Price
Outstanding at December 31, 2016	433		$	5.03
Forfeited, canceled or expired	(1	)	15.58
Exercised	(135	)	4.15
Outstanding at December 31, 2017	297		$	5.37

Stock options outstanding

Certain information regarding options outstanding at December 31, 2017 was as follows:



	Options Outstanding		Options Exercisable		Options Vested and Expected to Vest
Number (in thousands)	297		291		297
Weighted-average exercise price	$	5.37	$	5.19	$	5.37
Aggregate intrinsic value (in thousands)	$	2,405	$	2,401	$	2,405
Weighted average remaining contractual term (in years)	2.1		2.0		2.1

RSU activity

Compensation expense for RSAs is recognized over the estimated vesting period. Following is a summary of RSA activity (shares in thousands):



	RSAs Outstanding		Weighted- Average Grant Date Fair Value per Share
Outstanding at December 31, 2016	44		$	16.31
Granted	17		17.60
Vested	(14	)	17.91
Outstanding at December 31, 2017	47		$	16.28

Following is a summary of RSU activity (shares in thousands):



	RSUs Outstanding		Weighted- Average Grant Date Fair Value per Share
Outstanding at December 31, 2016	109		$	18.17
Granted	108		16.94
Forfeited, canceled or expired	(24	)	17.78
Vested	(2	)	19.07
Outstanding at December 31, 2017	191		$	17.64

PSU activity

Following is a summary of PSU activity (shares in thousands):



	PSUs Outstanding		Weighted- Average Grant Date Fair Value per Share
Outstanding at December 31, 2016	264		$	14.66
Granted and additional goal shares awarded	113		13.84
Forfeited, canceled or expired	(81	)	16.99
Vested	(124	)	8.23
Outstanding at December 31, 2017	172		$	17.65

Stock-based compensation

Stock-based compensation expense, primarily included in general and administrative expense, was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Stock options	$	84	$	389	$	327
RSAs	287		168		—
RSUs	954		734		544
PSUs	408		1,211		575
ESPP	123		111		38
	$	1,856	$	2,613	$	1,484

Other information regarding stock-based compensation

Certain other information regarding our stock-based compensation was as follows (in thousands, except per share amounts):



	Year Ended December 31,
	2017		2016		2015
Weighted average grant-date per share fair value of stock options granted	$	—	$	—	$	8.94
Total intrinsic value of stock options exercised	1,522		1,221		4,142
Fair value of RSUs vested	28		311		673
Fair value of PSUs vested	2,036		574		1,454

ESPP Activity

ESPP activity was as follows (shares in thousands):



	Shares Available for Issuance		Weighted- Average Purchase Price		Weighted-Average Discount per Share
Balance at December 31, 2016	469
Employee shares purchased	(37	)	$	13.20	$	2.19
Balance at December 31, 2017	432

Assumptions

Assumptions used in calculating the fair value of stock option grants and employee stock purchases were as follows:



	Year Ended December 31,
	2017	2016	2015
	ESPP	ESPP	ESPP	Options
Dividend yield	—%	—%	—%	—%
Risk-free interest rate	0.8%	0.4%	0.1%	1.6%
Expected life (years)	N/A	N/A	N/A	4.28
Expected volatility	44%	56%	43%	71%

Stock Repurchase Program Stock Repurchase Program (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Class of Treasury Stock

Repurchases for 2015 through 2017 for all programs were as follows:



Year Ended	Number of Shares	Repurchased Amount	Average Price per Share
December 31, 2015	711,708	$11,567,527	$16.25
December 31, 2016	319,805	5,390,355	16.86
December 31, 2017	788,416	11,054,983	14.02
Totals to Date	1,819,929	$28,012,865	$15.39

Income Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares Outstanding Used to Compute Income Per Share

The weighted average numbers of shares outstanding used to compute income per share amounts were as follows (in thousands):



	Year Ended December 31,
	2017	2016	2015
Shares used for basic per share calculations	30,671	31,032	31,288
Dilutive effect of outstanding options, RSUs, and PSUs	339	269	301
Shares used for diluted per share calculations	31,010	31,301	31,589

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The weighted average numbers of shares outstanding listed in the table below were anti-dilutive and excluded from the computation of diluted income per share, primarily because the average market price did not exceed the exercise price. These shares may be dilutive potential common shares in the future (in thousands):



	As of December 31,
	2017	2016	2015
Stock options	8	8	12

Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Summary Information by Reportable Segments

Following is summary information by reportable segment (in thousands):



	Year Ended December 31,
	2017			2016			2015
Net Sales:
Direct	$	219,440		$	225,057		$	225,595
Retail	183,875			177,920			106,195
Unallocated royalty	2,869			3,062			3,974
Consolidated net sales	$	406,184		$	406,039		$	335,764
Contribution:
Direct	$	34,900		$	43,215		$	39,940
Retail	27,495			29,451			12,850
Unallocated royalty	2,852			3,018			3,974
Consolidated contribution	$	65,247		$	75,684		$	56,764

Reconciliation of consolidated contribution to income from continuing operations:
Consolidated contribution	$	65,247		$	75,684		$	56,764
Amounts not directly related to segments:
Operating expenses	(28,944		)	(22,290		)	(16,493		)
Other expense, net	(598		)	(1,813		)	(249		)
Income tax expense	8,080			16,480			13,219
Income from continuing operations	$	27,625		$	35,101		$	26,803

Depreciation and amortization expense:
Direct	$	1,666		$	1,944		$	868
Retail	4,606			4,775			757
Unallocated corporate	2,371			1,155			1,787
Total depreciation and amortization expense	$	8,643		$	7,874		$	3,412

	As of December 31,
Assets:	2017			2016
Direct	$	40,532		$	37,388
Retail	192,064			206,580
Unallocated corporate	92,180			89,098
Total assets	$	324,776		$	333,066

Net Sales by Geographic Regions

Net sales by geographic area were as follows:



	Year Ended December 31,
	2017		2016		2015
U.S.	$	352,703	$	353,893	$	295,366
Canada	25,589		26,005		33,230
All other	27,892		26,141		7,168
	$	406,184	$	406,039	$	335,764

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Rent Expense

Rent expense under all operating leases was as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Rent expense	$	6,095	$	6,561	$	5,033

Schedule of Future Minimum Rental Payments for Operating Leases

As of December 31, 2017, future minimum lease payments under non-cancellable leases, reduced for sublease income, were as follows (in thousands):



2018	$	5,016
2019	5,035
2020	4,983
2021	4,021
2022	2,703
Thereafter	4,353
	$	26,111

Supplementary Information - Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

The following table summarizes our unaudited quarterly financial data for 2017 and 2016 (in thousands, except per share amounts):



	Quarter Ended
	March 31			June 30			September 30			December 31			Total
2017
Net sales	$	113,252		$	77,029		$	88,132		$	127,771		$	406,184
Gross profit	61,745			38,378			41,315			62,444			203,882
Operating income⁽¹⁾	12,683			3,849			13,365			6,406			36,303
Income from continuing operations⁽²⁾	8,185			2,566			8,342			8,532			27,625
Loss from discontinued operations⁽³⁾	(1,092		)	(77		)	(101		)	(88		)	(1,358		)
Net income	7,093			2,489			8,241			8,444			26,267
Net income per share:
Basic	$	0.23		$	0.08		$	0.27		$	0.28		$	0.86
Diluted	0.23			0.08			0.27			0.27			0.85

2016
Net sales	$	120,928		$	78,529		$	80,818		$	125,764		$	406,039
Gross profit	66,344			41,862			39,217			64,102			211,525
Operating income	19,300			6,573			8,211			19,310			53,394
Income from continuing operations⁽⁴⁾	11,586			3,696			7,845			11,974			35,101
Loss from discontinued operations	(142		)	(166		)	(251		)	(364		)	(923		)
Net income	11,444			3,530			7,594			11,610			34,178
Net income per share:
Basic	$	0.37		$	0.11		$	0.24		$	0.38		$	1.10
Diluted	0.37			0.11			0.24			0.37			1.09

⁽¹⁾ Operating income for the quarter ended December 31, 2017 included an $8.8 million non-cash asset impairment charge related to the Octane Fitness brand name.

⁽³⁾Loss from discontinued operations for the quarter ended March 31, 2017 included a $1.2 million expense related to a lawsuit settlement with Biosig Instruments, Inc.

Significant Accounting Policies (Details)		12 Months Ended
Significant Accounting Policies (Details)	Jan. 01, 2017 USD ($)	Dec. 31, 2017 USD ($) customer	Dec. 31, 2016 USD ($) customer	Dec. 31, 2015 USD ($) customer
Significant Accounting Policies [Line Items]
Asset impairment charge		$ 8,800,000	$ 0	$ 0
Movement in Valuation Allowances and Reserves [Roll Forward]
Marketing and advertising expense		66,400,000	60,700,000	$ 54,800,000
Prepaid advertising		$ 1,500,000	$ 3,500,000
Minimum
Significant Accounting Policies [Line Items]
Product Warranty Period		30 days
Furniture, equipment and information systems [Member] \| Minimum
Significant Accounting Policies [Line Items]
Estimated useful life (in years)		3 years
Furniture, equipment and information systems [Member] \| Maximum
Significant Accounting Policies [Line Items]
Estimated useful life (in years)		7 years
Customer Concentration Risk \| Consolidated Net Sales
Significant Accounting Policies [Line Items]
Number of major customers \| customer		1	1,000	1,000
Customer Concentration Risk \| Customer A [Member] \| Consolidated Net Sales \| Minimum
Significant Accounting Policies [Line Items]
Concentration risk, percentage		10.00%	10.00%	10.00%
Customer Concentration Risk \| Customer A [Member] \| Consolidated Net Sales \| Maximum
Significant Accounting Policies [Line Items]
Concentration risk, percentage		15.00%	15.00%	15.00%
Sales Discounts and Returns Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 5,901,000	$ 5,901,000	$ 5,677,000	$ 4,296,000
Charges to reserve		18,377,000	12,935,000	16,700,000
Reductions for sales discounts and returns		(17,358,000)	(12,711,000)	(15,569,000)
Business acquisition (Note 2)		0	0	250,000
Ending Balance		6,920,000	5,901,000	$ 5,677,000
Fair Value, Measurements, Recurring
Significant Accounting Policies [Line Items]
Cash Equivalents		$ 12,942,000	$ 13,634,000
Accounting Standards Update 2016-09
Movement in Valuation Allowances and Reserves [Roll Forward]
Cumulative effect on retained earnings	$ 28,308

Business Acquisition (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Business Acquisition [Line Items]
Maximum revolving secured credit line		$ 20,000,000
Goodwill	$ 60,470,000	62,030,000	$ 61,888,000	$ 2,520,000
Octane Fitness
Business Acquisition [Line Items]
Purchase price	115,000,000.0
Goodwill		59,705,000
JPMorgan Chase Bank, N.A. \| Term Loan \| Line of Credit
Business Acquisition [Line Items]
Maximum revolving secured credit line		$ 80,000,000
JPMorgan Chase Bank, N.A. \| Term Loan \| Line of Credit \| Octane Fitness
Business Acquisition [Line Items]
Maximum revolving secured credit line	$ 80,000,000.0

Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 62,030	$ 61,888	$ 60,470	$ 2,520
Octane Fitness
Business Acquisition [Line Items]
Cash	7,759
Accounts receivable	12,476
Inventories	13,134
Prepaid expenses	885
Deferred tax assets	1,303
Property, plant and equipment	3,372
Intangible assets	63,100
Total assets acquired	102,029
Accounts payable	6,497
Accrued liabilities	2,968
Warranty obligations	5,550
Deferred tax liabilities, non-current	21,033
Other non-current liabilities	390
Total liabilities assumed	36,438
Net identifiable assets acquired	65,591
Goodwill	59,705
Net assets acquired	$ 125,296

Business Acquisition - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Combinations [Abstract]
Net sales	$ 406,039	$ 400,078
Net income	$ 35,683	$ 29,352
Basic (in dollars per share)	$ 1.15	$ 0.94
Diluted (in dollars per share)	$ 1.14	$ 0.93

Discontinued Operation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Discontinued Operation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss from discontinued operations before income taxes									$ (1,713)	$ (1,077)	$ (601)
Income tax benefit										154	400
Loss from discontinued operations	$ (88)	$ (101)	$ (77)	$ (1,092)	$ (364)	$ (251)	$ (166)	$ (142)	(1,358)	(923)	(201)
Payments for legal settlements				$ 1,200					1,200
Commercial [Member]
Loss from discontinued operations before income taxes									(1,713)	(1,077)	(601)
Income tax benefit									355	154	400
Loss from discontinued operations									$ (1,358)	$ (923)	$ (201)

- Definition

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment charge	$ 8,800	$ 0	$ 0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	12,942	13,634
Available-for-Sale Securities	57,303	31,743
Derivative assets	762
Total assets measured at fair value	71,007	45,377
Total liabilities measured at fair value		(38)
Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	10,946	9,635
Available-for-Sale Securities	0	0
Derivative assets	0
Total assets measured at fair value	10,946	9,635
Total liabilities measured at fair value		0
Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	1,996	3,999
Available-for-Sale Securities	57,303	31,743
Derivative assets	762
Total assets measured at fair value	60,061	35,742
Total liabilities measured at fair value		(38)
Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Available-for-Sale Securities	0	0
Derivative assets	0
Total assets measured at fair value	0	0
Total liabilities measured at fair value		0
Money market funds \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	10,946	9,635
Money market funds \| Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	10,946	9,635
Money market funds \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Money market funds \| Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Certificates of deposit \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	19,875	22,820
Certificates of deposit \| Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	0	0
Certificates of deposit \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	19,875	22,820
Certificates of deposit \| Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	0	0
Commercial paper \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	1,996	3,999
Commercial paper \| Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Commercial paper \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	1,996	3,999
Commercial paper \| Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Corporate bonds \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	29,239	6,922
Corporate bonds \| Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	0	0
Corporate bonds \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	29,239	6,922
Corporate bonds \| Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	0	0
U.S. government bonds \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	8,189	2,001
U.S. government bonds \| Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	0	0
U.S. government bonds \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	8,189	2,001
U.S. government bonds \| Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities	0	0
Interest rate swap contract \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	372
Derivative liabilities		(38)
Interest rate swap contract \| Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Derivative liabilities		0
Interest rate swap contract \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	372
Derivative liabilities		(38)
Interest rate swap contract \| Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Derivative liabilities		$ 0
Foreign currency forward contracts \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	390
Foreign currency forward contracts \| Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Foreign currency forward contracts \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	390
Foreign currency forward contracts \| Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 0

Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Interest rate swap contract
Derivative [Line Items]
Derivative, notional amount	$ 48,000
Derivative, fixed interest rate	1.42%
Interest rate swap contract \| LIBOR
Derivative [Line Items]
Derivative, basis spread on variable rate	1.35%
Foreign currency forward contracts
Derivative [Line Items]
Derivative, notional amount	$ 22,100
Derivatives Designated as Hedging Instruments \| Interest rate swap contract
Derivative [Line Items]
Fair value of liability derivatives	372	$ (38)
Derivatives Designated as Hedging Instruments \| Prepaids and other current assets \| Interest rate swap contract
Derivative [Line Items]
Derivative asset, fair value, gross asset	134	0
Derivatives Designated as Hedging Instruments \| Accrued liabilities \| Interest rate swap contract
Derivative [Line Items]
Fair value of liability derivatives	$ 0	$ (38)

Derivatives - Fair value of derivative instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Interest rate swap contract \| Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 372	$ (38)
Interest rate swap contract \| Derivatives Designated as Hedging Instruments \| Prepaids and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	134	0
Interest rate swap contract \| Derivatives Designated as Hedging Instruments \| Other assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	238	0
Interest rate swap contract \| Derivatives Designated as Hedging Instruments \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	0	(38)
Foreign currency forward contracts \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	390	0
Foreign currency forward contracts \| Not Designated as Hedging Instrument \| Prepaids and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	$ 390	$ 0

Derivatives - Effect On Condensed Consolidated Statements of Operations (Details) - Interest rate swap contract - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of liability derivatives	$ 372	$ (38)
Derivatives Designated as Hedging Instruments \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income before reclassifications	80	(450)	$ 0
Derivatives Designated as Hedging Instruments \| Cash Flow Hedging \| Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from accumulated other comprehensive income to earnings for the effective portion	(207)	(626)	0
Derivatives Designated as Hedging Instruments \| Cash Flow Hedging \| Income tax expense
Derivative Instruments, Gain (Loss) [Line Items]
Income tax benefit	47	200	0
Not Designated as Hedging Instrument \| Cash Flow Hedging \| Income tax expense
Derivative Instruments, Gain (Loss) [Line Items]
Income tax benefit	86	0	0
Not Designated as Hedging Instrument \| Cash Flow Hedging \| Other, net
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in earnings	(382)	0	$ 0
Accrued liabilities \| Derivatives Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of liability derivatives	$ 0	$ (38)

Trade Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
Trade Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Trade receivables	$ 42,804	$ 45,628
Allowance for doubtful accounts	(119)	(170)
Total trade receivable	42,685	45,458
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, January 1	170	918	$ 108
Charges to bad debt expense	311	289	786
Recoveries (write-offs), net	(362)	(1,037)	24
Balance, December 31	$ 119	$ 170	$ 918

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 48,771	$ 43,130
Parts and components	4,583	3,900
Total inventories	$ 53,354	$ 47,030

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 39,114	$ 45,517
Accumulated depreciation	(23,287)	(28,049)
Total property, plant and equipment, net	15,827	17,468
Depreciation expense	5,387	4,320	$ 2,558
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 23	139
Automobiles [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Automobiles [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	6 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,542	3,388
Leasehold improvements [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	4 years
Leasehold improvements [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 17,024	25,899
Computer equipment [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Computer equipment [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	7 years
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15,178	13,085
Machinery and equipment [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Machinery and equipment [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,295	2,238
Furniture and fixtures [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Furniture and fixtures [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Work in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,052	$ 768

Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance	$ 61,888	$ 60,470	$ 2,520
Currency exchange rate adjustment	142	70	(407)
Goodwill, Purchase Accounting Adjustments		1,348
Measurement period adjustments (Note 2)			58,357
Balance	62,030	61,888	60,470
Direct
Goodwill [Roll Forward]
Balance	2,180	2,113	2,520
Currency exchange rate adjustment	155	67	(407)
Goodwill, Purchase Accounting Adjustments		0
Measurement period adjustments (Note 2)			0
Balance	2,335	2,180	2,113
Retail
Goodwill [Roll Forward]
Balance	59,708	58,357	0
Currency exchange rate adjustment	(13)	3	0
Goodwill, Purchase Accounting Adjustments		1,348
Measurement period adjustments (Note 2)			58,357
Balance	$ 59,695	$ 59,708	$ 58,357

Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite life trademarks	$ 23,252	$ 32,052
Intangible Assets, Gross (Excluding Goodwill)	65,739	90,839
Accumulated amortization - patents	(7,996)	(21,039)
Total other intangible assets, net	57,743	69,800
Amortization expense for intangible assets	3,256	3,554	$ 854
2018	3,164
2019	3,134
2020	3,108
2021	3,078
2022	3,078
Thereafter	18,929
Finite-Lived Intangible Assets, Net	34,491
Definite-lived trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	2,600	2,600
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	15,187	31,487
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 24,700	$ 24,700
Minimum \| Definite-lived trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years
Minimum \| Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	8 years
Minimum \| Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years
Maximum \| Definite-lived trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years
Maximum \| Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	24 years
Maximum \| Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years

Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities [Abstract]
Payroll and benefits	$ 3,659	$ 4,579
Other	7,105	8,313
Accrued liabilities	$ 10,764	$ 12,892

Product Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
Product Warranties (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Product Warranty Liability [Roll Forward]
Beginning Balance	$ 7,450	$ 8,545	$ 2,246
Accruals	3,008	2,480	2,302
Payments	(4,341)	(3,575)	(1,553)
Business acquisition (Note 2)	0	0	5,550
Ending Balance	$ 6,117	$ 7,450	$ 8,545

Borrowings (Loan Agreement) (Details)	Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Maximum revolving secured credit line	$ 20,000,000
Borrowing rate under agreement, at period end	2.35%
Avaiable for borrowing under line of credit	$ 20,000,000.0
2018	16,000,000
2019	16,000,000
2020	16,000,000
Long-term Debt	48,000,000
Line of Credit \| JPMorgan Chase Bank, N.A. \| Term Loan
Line of Credit Facility [Line Items]
Maximum revolving secured credit line	80,000,000
Amount outstanding	$ 48,000,000.0

Income Taxes - Income (Loss) Before Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States	$ 34,259	$ 50,651	$ 39,242
Non-U.S.	1,446	930	780
Income from continuing operations before income taxes	$ 35,705	$ 51,581	$ 40,022

Income Taxes - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
U.S. federal	$ 14,409	$ 6,765	$ 858
U.S. state	1,887	318	171
Non-U.S.	330	118	355
Total current	16,626	7,201	1,384
Deferred:
U.S. federal	(9,418)	8,130	11,324
U.S. state	819	1,037	573
Non-U.S.	53	112	(62)
Total deferred	(8,546)	9,279	11,835
Total income tax expense (benefit)	$ 8,080	$ 16,480	$ 13,219

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Components of Deferred Tax Assets and Liabilities [Abstract]
Accrued liabilities	$ 3,000	$ 5,089
Allowance for doubtful accounts	12	40
Inventory valuation	254	199
Capitalized indirect inventory costs	383	497
Stock-based compensation expense	897	1,346
Deferred rent	588	865
Accrued royalty	0	429
Net operating loss carryforward	1,715	2,377
Basis difference on long-lived assets	548	1,052
Credit carryforward	634	615
Other	179	140
Total deferred income tax assets before valuation allowance	8,210	12,649
Valuation allowance	(914)	(886)
Total deferred income tax assets, net of valuation allowance	7,296	11,763
Prepaid advertising	(370)	(1,302)
Other prepaids	(610)	(744)
Basis difference of long-lived assets	(14,856)	(26,215)
Undistributed earnings of foreign subsidiaries	0	(457)
Other	(18)	(25)
Deferred income tax liabilities	(15,854)	(28,743)
Net deferred income tax liabilities	(8,558)	$ (16,980)
Domestic Tax Authority [Member] \| Loss and Other Credit Carryforward [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation allowance	$ (700)

Income Taxes - Deferred Tax Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Net Deferred Income Tax Liability [Abstract]
Deferred income tax assets, non-current	$ 0	$ 11
Non-current deferred income tax liabilities	(8,558)	(16,991)
Net deferred income tax liabilities	$ (8,558)	$ (16,980)

Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
U.S. statutory income tax rate		35.00%	35.00%	35.00%
State tax, net of U.S. federal tax benefit		5.00%	2.40%	2.60%
Non-U.S. income taxes		(0.10%)	0.30%	(0.10%)
Nondeductible incentive stock option expense		0.80%	0.30%	0.80%
Research and development credit		(1.50%)	(1.00%)	(0.60%)
Change in deferred tax measurement rate		(15.30%)	(0.10%)	0.00%
Change in uncertain tax positions		0.80%	(5.10%)	1.10%
Excess tax benefits from stock plans		(2.10%)	0.00%	0.00%
Valuation allowance		0.10%	0.20%	(5.80%)
Other		(0.10%)	(0.10%)	0.00%
Effective income tax rate for continuing operations		22.60%	31.90%	33.00%
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense	$ 5,600
Valuation allowance	914	$ 914	$ 886
Loss and Other Credit Carryforward [Member] \| Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	700	700
Loss and Other Credit Carryforward [Member] \| Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 200	$ 200

Income Taxes - Carryforwards (Details) $ in Millions	Dec. 31, 2017 USD ($)
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 32.0
Income tax credit carryforwards	0.9
Switzerland
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 0.8

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year		$ 1,970	$ 2,519	$ 2,768
Additions for tax positions taken in prior years	$ 2,700	38	21	1
Reductions for tax positions taken in prior years		(5)	(523)	(426)
Additions for tax positions related to the current year		211	83	43
Other		(9)	0	133
Lapses of statutes of limitations		(11)	(130)	0
Unrecognized tax benefits, end of year		2,194	1,970	2,519
Unrecognized tax benefits that would impact effective tax rate, if recognized		2,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		300	(1,900)	$ 500
Cumulative liability for interest and penalties related to uncertain tax positions		1,000	$ 700
Previously unrecognized tax benefit likely to be recognized within the next 12 months		$ 800

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 160,857	$ 126,991	$ 111,072
Other comprehensive income (loss)	958	110	(1,019)
Ending balance	179,189	160,857	126,991
Unrealized Gain (Loss) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(8)	(16)	(18)
Current period other comprehensive income (loss) before reclassifications	(56)	8	2
Reclassification of amounts to earnings	0	0
Other comprehensive income (loss)	(56)	8
Ending balance	(64)	(8)	(16)
Gain (loss) on Derivative Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(24)	0	0
Current period other comprehensive income (loss) before reclassifications	80	(450)	0
Reclassification of amounts to earnings	160	426
Other comprehensive income (loss)	240	(24)
Ending balance	216	(24)	0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,185)	(1,311)	(290)
Current period other comprehensive income (loss) before reclassifications	774	126	(1,021)
Reclassification of amounts to earnings	0	0
Other comprehensive income (loss)	774	126
Ending balance	(411)	(1,185)	(1,311)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,217)	(1,327)	(308)
Current period other comprehensive income (loss) before reclassifications	798	(316)	(1,019)
Reclassification of amounts to earnings	160	426
Other comprehensive income (loss)	958	110
Ending balance	$ (259)	$ (1,217)	$ (1,327)

Stock-Based Compensation (Detail) - shares	12 Months Ended
Stock-Based Compensation (Detail) - shares	Dec. 31, 2017	Apr. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares reserved for future issuance	4,900,000
2015 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized		4,800,000
Reduction in number of shares available for issuance due to settlement of stock appreciation rights and stock unit or performance unit award	2
Reduction in number of shares available for issuance due to settlement of stock option award	1
Shares available for issuance	4,200,000
Maximum aggregate shares of common stock subject to stock options, appreciation rights, restricted stock or performance stock unit awards	1,000,000.0
Stock options \| 2015 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	7 years
Stock options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years

Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock Option Activity and Outstanding Options
Options outstanding	433
Forfeited, cancelled or expired	(1)
Exercised	(135)
Options outstanding	297	433
Stock Option Activity and Weighted-Average Exercise Price
Beginning of period, Weighted Average Exercise Price (in dollars per share)	$ 5.03
Forfeited, canceled or expired, Weighted Average Exercise Price (in dollars per share)	15.58
Exercises, Weighted Average Exercise Price (in dollars per share)	4.15
End of period, Weighted Average Exercise Price (in dollars per share)	$ 5.37	$ 5.03
Options outstanding, Aggregate Intrinsic Value	$ 2,405
Options outstanding, Weighted-Average Remaining Contractual Life	2 years 1 month 6 days
Options exercisable, Number of Options Exercisable	291
Options exercisable, Weighted-Average Exercise Price	$ 5.19
Options exercisable, aggregate intrinsic value	$ 2,401
Options exercisable, Weighted average remaining contractual term	2 years
Vested and expected to vest	297
Vested and expected to vest, Weighted Average Exercise Price	$ 5.37
Vested and expected to vest, Aggregate Intrinsic Value	$ 2,405
Vested and expected to vest, remaining contractual term (in years)	2 years 1 month 6 days
General and administrative	$ 1,856	$ 2,613	$ 1,484
Weighted average grant-date fair value of stock options granted	$ 0	$ 0	$ 8.94
Stock options
Stock Option Activity and Weighted-Average Exercise Price
General and administrative	$ 84	$ 389	$ 327
Compensation expense for unvested stock options	$ 2,600
Minimum \| Stock options
Stock Option Activity and Weighted-Average Exercise Price
Weighted average period for unvested stock options	4 months 24 days
Maximum \| Stock options
Stock Option Activity and Weighted-Average Exercise Price
Weighted average period for unvested stock options	1 year 3 months 18 days

Stock-Based Compensation - Stock-based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative	$ 1,856	$ 2,613	$ 1,484
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative	84	389	327
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative	287	168	0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative	954	734	544
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative	408	1,211	575
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative	$ 123	$ 111	$ 38

Stock-Based Compensation- RSU and RSA Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Restricted Stock Awards
Restricted Stock Units Activity and Outstanding
Outstanding, beginning of period \| shares	44
Granted \| shares	17
Vested (in shares) \| shares	(14)
Outstanding, end of period \| shares	47
Restricted Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Beginning of period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 16.31
Granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	17.60
Vested, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	17.91
End of period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 16.28
Restricted Stock Units
Restricted Stock Units Activity and Outstanding
Outstanding, beginning of period \| shares	109
Granted \| shares	108
Forfeited \| shares	(24)
Vested (in shares) \| shares	(2)
Outstanding, end of period \| shares	191
Restricted Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Beginning of period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 18.17
Granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	16.94
Forfeited, Weighted Average Grante Date Fair Value (in dollars per share) \| $ / shares	17.78
Vested, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	19.07
End of period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 17.64

Stock-Based Compensation - Performance Stock Units (Details) - Performance Shares - $ / shares	1 Months Ended				6 Months Ended	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Dec. 31, 2015	Feb. 28, 2014	Sep. 30, 2015	Dec. 31, 2017
Performance Stock Units Activity and Outstanding
Outstanding, beginning of period						264,000
Granted						113,000
Forfeited						(81,000)
Vested (in shares)						(124,000)
Outstanding, end of period						172,000
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Beginning of period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 14.66
Granted, Weighted Average Grant Date Fair Value (in dollars per share)						13.84
Forfeited, Weighted Average Grante Date Fair Value (in dollars per share)						16.99
Vested, Weighted Average Grant Date Fair Value (in dollars per share)						8.23
End of period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 17.65
February 2014 PSU Awards \| Key Executive Employees Member
Performance Stock Units Activity and Outstanding
Granted				82,494
Vested (in shares)						(123,739)
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting period						3 years
February 2014 PSU Awards \| Minimum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						60.00%
February 2014 PSU Awards \| Maximum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						150.00%
April And September 2015 PSU Awards \| Key Executive Employees Member
Performance Stock Units Activity and Outstanding
Granted					56,820
Outstanding, end of period						44,900
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting period						3 years
April And September 2015 PSU Awards \| Minimum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						60.00%
April And September 2015 PSU Awards \| Maximum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						150.00%
February 2016 PSU Awards \| Key Executive Employees Member
Performance Stock Units Activity and Outstanding
Granted		54,818
Outstanding, end of period						48,600
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting period						3 years
February 2016 PSU Awards \| Minimum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						60.00%
February 2016 PSU Awards \| Maximum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						150.00%
December 2015 PSU Awards \| Key Executive Employees Member
Performance Stock Units Activity and Outstanding
Granted			117,230
Outstanding, end of period						13,600
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting period						3 years
December 2015 PSU Awards \| Minimum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						60.00%
December 2015 PSU Awards \| Maximum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						150.00%
February 2017 PSU Awards \| Key Executive Employees Member
Performance Stock Units Activity and Outstanding
Granted	72,017
Outstanding, end of period						65,100
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting period						3 years
February 2017 PSU Awards \| Minimum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						60.00%
February 2017 PSU Awards \| Maximum \| Key Executive Employees Member
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share
Vesting percentage						150.00%

Stock-Based Compensation Stock Compensation, Other (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of stock options granted	$ 0	$ 0	$ 8.94
Total intrinsic value of stock options exercised	$ 1,522	$ 1,221	$ 4,142
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of units vested	28	311	673
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of units vested	$ 2,036	$ 574	$ 1,454

Stock-Based Compensation Fair Value Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	0.80%	0.40%	0.10%
Expected volatility	44.00%	56.00%	43.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield			0.00%
Risk-free interest rate			1.60%
Expected life (years)			4 years 3 months 10 days
Expected volatility			71.00%

Stock-Based Compensation - Employee Stock Purchase Plan (Details) - Employee Stock - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Apr. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance	432	469
Discount from market price, offering date	90.00%
Percentage of outstanding stock maximum	5.00%
Number of shares authorized			500
Employee shares purchased (shares)	(37)
Weighted- Average Purchase Price	$ 13.20
Weighted-Average Discount per Share	$ 2.19

Stock Repurchase Program (Details) - USD ($)		3 Months Ended	12 Months Ended			36 Months Ended
Stock Repurchase Program (Details) - USD ($)	Nov. 03, 2014	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Apr. 25, 2017	May 04, 2016
Class of Stock [Line Items]
Repurchased Amount			$ 11,055,000	$ 5,390,000	$ 11,567,000
Common Stock
Class of Stock [Line Items]
Number of Shares		788,416		319,805	711,708	1,819,929
Repurchased Amount		$ 11,054,983		$ 5,390,355	$ 11,567,527	$ 28,012,865
Average Price per Share		$ 14.02		$ 16.86	$ 16.25	$ 15.39
15 Million Authorization, Expiring November 3, 2016 \| Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount	$ 15,000,000.0
Stock Repurchase Program, Period in Force	24 months
10 Million Authorization Expansion, Expiring May 4, 2018 \| Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount								$ 10,000,000.0
Repurchased Amount			8,100,000
15 Million Authorization, Expiring April 25, 2019 \| Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount							$ 15,000,000.0
Remaining authorized repurchase amount		$ 12,000,000.0	12,000,000.0			$ 12,000,000.0
Repurchased Amount			$ 3,000,000.0

Income Per Share (Details) - shares shares in Thousands	12 Months Ended
Income Per Share (Details) - shares shares in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income per share:
Basic weighted average shares outstanding	30,671	31,032	31,288
Dilutive potential common shares	339	269	301
Diluted weighted average shares outstanding	31,010	31,301	31,589
Stock options
Income per share:
Anti-dilutive securities excluded from computation of diluted income per share	8	8	12

401(k) Savings Plan (Details) - Other Pension, Postretirement and Supplemental Plans [Member] - 401K Savings Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Percent of employer's match of the employee's first 1% of eligible pay	100.00%
Percent of employee eligible pay (first 1%)	1.00%
Percent of employer's match of the employee's next 5% of eligible pay	50.00%
Percent of employee eligible pay (next 5%)	5.00%
Maximum employer matching, percent	3.50%
Annual vesting percentage	25.00%
Employer's match after two years (fully vested)	100.00%
Number of years until employer matches 100%	2 years
401(k) matching contributions	$ 1,056	$ 1,014	$ 746

Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
Segment Information (Details) $ in Thousands	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment									2
Net sales	$ 127,771	$ 88,132	$ 77,029	$ 113,252	$ 125,764	$ 80,818	$ 78,529	$ 120,928	$ 406,184	$ 406,039	$ 335,764
Consolidated contribution									65,247	75,684	56,764
Operating Expenses									167,579	158,131	132,963
Reconciliation of consolidated contribution to income (loss) from continuing operations:
Income tax expense									(8,080)	(16,480)	(13,219)
Income from continuing operations	8,532	$ 8,342	$ 2,566	$ 8,185	11,974	$ 7,845	$ 3,696	$ 11,586	27,625	35,101	26,803
Depreciation and amortization expense									8,643	7,874	3,412
Assets	324,776				333,066				324,776	333,066
UNITED STATES
Segment Reporting Information [Line Items]
Net sales									352,703	353,893	295,366
CANADA
Segment Reporting Information [Line Items]
Net sales									25,589	26,005	33,230
All Other
Segment Reporting Information [Line Items]
Net sales									27,892	26,141	7,168
Direct
Segment Reporting Information [Line Items]
Net sales									219,440	225,057	225,595
Consolidated contribution									34,900	43,215	39,940
Reconciliation of consolidated contribution to income (loss) from continuing operations:
Depreciation and amortization expense									1,666	1,944	868
Assets	40,532				37,388				40,532	37,388
Retail
Segment Reporting Information [Line Items]
Net sales									183,875	177,920	106,195
Consolidated contribution									27,495	29,451	12,850
Reconciliation of consolidated contribution to income (loss) from continuing operations:
Depreciation and amortization expense									4,606	4,775	757
Assets	192,064				206,580				192,064	206,580
Unallocated royalty income [Member]
Segment Reporting Information [Line Items]
Net sales									2,869	3,062	3,974
Consolidated contribution									2,852	3,018	3,974
Unallocated corporate [Member]
Reconciliation of consolidated contribution to income (loss) from continuing operations:
Depreciation and amortization expense									2,371	1,155	1,787
Assets	$ 92,180				$ 89,098				92,180	89,098
Less expenses not directly related to segments [Member]
Segment Reporting Information [Line Items]
Operating Expenses									(28,944)	(22,290)	(16,493)
Reconciliation of consolidated contribution to income (loss) from continuing operations:
Other income (expense), net									(598)	(1,813)	(249)
Income tax expense									$ (8,080)	$ (16,480)	$ (13,219)
Customer Concentration Risk \| Sales Revenue, Net \| Amazon.com
Reconciliation of consolidated contribution to income (loss) from continuing operations:
Net sales outside of the United States, percent of consolidated net sales									11.90%	11.30%	11.10%

Commitments and Contingencies - Operating Lease (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Rent expense under all operating leases	$ 6,095	$ 6,561	$ 5,033
2017	5,016
2018	5,035
2019	4,983
2020	4,021
2021	2,703
Thereafter	4,353
Total minimum non-cancelable lease payments, net	$ 26,111

Supplementary Information - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 127,771	$ 88,132	$ 77,029	$ 113,252	$ 125,764	$ 80,818	$ 78,529	$ 120,928	$ 406,184	$ 406,039	$ 335,764
Gross profit	62,444	41,315	38,378	61,745	64,102	39,217	41,862	66,344	203,882	211,525	173,234
Operating income (loss)	6,406	13,365	3,849	12,683	19,310	8,211	6,573	19,300	36,303	53,394	40,271
Income from continuing operations	8,532	8,342	2,566	8,185	11,974	7,845	3,696	11,586	27,625	35,101	26,803
Income (loss) from discontinued operation	(88)	(101)	(77)	(1,092)	(364)	(251)	(166)	(142)	(1,358)	(923)	(201)
Net income	$ 8,444	$ 8,241	$ 2,489	$ 7,093	$ 11,610	$ 7,594	$ 3,530	$ 11,444	$ 26,267	$ 34,178	$ 26,602
Basic (in dollars per share)	$ 0.28	$ 0.27	$ 0.08	$ 0.23	$ 0.38	$ 0.24	$ 0.11	$ 0.37	$ 0.86	$ 1.10	$ 0.85
Diluted (in dollars per share)	$ 0.27	$ 0.27	$ 0.08	$ 0.23	$ 0.37	$ 0.24	$ 0.11	$ 0.37	$ 0.85	$ 1.09	$ 0.84
Asset impairment charge									$ 8,800	$ 0	$ 0
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense	$ 5,600
Payments for legal settlements				$ 1,200					1,200
Additions for tax positions taken in prior years						$ 2,700			$ 38	$ 21	$ 1

Subsequent Event (Details) $ in Millions	Feb. 21, 2018 USD ($)
February 2018, 15 Million Share Repurchase Program \| Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 15.0