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Selected Quarterly Financial Data (Unaudited) - Effect of Restatement Categories of Restatement (Details) - USD ($)	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]
Net sales	$ 131,476,000	$ 99,953,000	$ 100,922,000	$ 84,265,000	$ 98,280,000	$ 78,944,000	$ 85,771,000	$ 76,470,000	$ 416,616,000	$ 339,465,000	$ 362,387,000	$ 347,580,000
(Loss) income before taxes	$ (6,450,000)	$ (9,053,000)	$ (7,612,000)	$ (24,054,000)	$ (7,878,000)	$ (10,509,000)	$ (10,792,000)	(6,680,000)	$ (47,169,000)	$ (35,859,000)	(12,593,000)	29,221,000
Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								14,656,000			(27,059,000)	(415,000)
(Loss) income before taxes								2,251,000			(26,483,000)	(5,318,000)
Previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								61,814,000			389,446,000	347,995,000
(Loss) income before taxes								(8,931,000)			13,890,000	34,539,000
Revenue recognition adjustments | Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								14,656,000			(27,059,000)	(415,000)
(Loss) income before taxes								3,111,000			(9,215,000)	(2,700,000)
Product development cost | Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0			0
(Loss) income before taxes								123,000			(1,001,000)	(2,397,000)	$ (3,600,000)
Inventory valuation | Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0			0
(Loss) income before taxes								(404,000)			(1,069,000)	38,000	(1,500,000)
Impairment of long-lived assets | Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0			0
(Loss) income before taxes								(557,000)			(11,733,000)	(310,000)
Product warranty | Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0			0
(Loss) income before taxes								(319,000)			(2,484,000)	591,000
Accrued liabilities | Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0			0
(Loss) income before taxes								422,000			(1,106,000)	591,000	300,000
Equity investment | Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0			0	0
(Loss) income before taxes								$ (125,000)			$ 125,000	$ (286,000)	$ 300,000

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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