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Restatement of Previously Issued Consolidated Financial Statements - Pre-2014 Restatement Adjustments (Details) - USD ($) $ 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	Dec. 31, 2014	Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Loss) income before taxes	$ (6,450)	$ (9,053)	$ (7,612)	$ (24,054)	$ (7,878)	$ (10,509)	$ (10,792)	$ (6,680)	$ (47,169)	$ (35,859)	$ (12,593)	$ 29,221
Stockholders' equity	32,172	$ 6,129	$ 18,210	$ 30,048	40,660	$ 46,967	$ 55,337	81,900	32,172	40,660	84,873	86,483	$ 47,607
Common stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity	19				12				19	12	11	11	11
Additional paid-in capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity	123,838				86,764				123,838	86,764	83,377	81,746	61,930
Accumulated deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity	(82,147)				(34,535)				(82,147)	(34,535)	12,937	15,828	(5,649)
Treasury stock, at cost
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity	$ (9,538)				$ (11,581)				$ (9,538)	$ (11,581)	(11,452)	(11,102)	(8,685)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Loss) income before taxes								(8,931)			13,890	34,539
Stockholders' equity								101,367			106,297	90,799	50,421
Previously Reported | Common stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													11
Previously Reported | Additional paid-in capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													57,308
Previously Reported | Accumulated deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													(2,648)
Previously Reported | Treasury stock, at cost
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													(4,250)
Restatement Adjustments and Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Loss) income before taxes								2,251			(26,483)	(5,318)
Stockholders' equity								(19,467)			(21,424)	(4,316)	(2,891)
Restatement Adjustments and Reclassifications | Common stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													0
Restatement Adjustments and Reclassifications | Additional paid-in capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													4,622
Restatement Adjustments and Reclassifications | Accumulated deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													(3,079)
Restatement Adjustments and Reclassifications | Treasury stock, at cost
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity													(4,435)
Product development cost | Restatement Adjustments and Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Loss) income before taxes								123			(1,001)	(2,397)	(3,600)
Inventory valuation | Restatement Adjustments and Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Loss) income before taxes								(404)			(1,069)	38	(1,500)
Accrued liabilities | Restatement Adjustments and Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Loss) income before taxes								422			(1,106)	591	300
Equity investment | Restatement Adjustments and Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Loss) income before taxes								$ (125)			$ 125	$ (286)	$ 300

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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