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Restatement of Previously Issued Consolidated Financial Statements - Effects of Restatement Adjustments on Net Sales and Income (Loss) Before Income Tax (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
Income (Loss) Before Income 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
Previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								61,814,000			389,446,000	347,995,000
Income (Loss) Before Income Taxes								(8,931,000)			13,890,000	34,539,000
Restatement adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								14,656,000			(27,059,000)	(415,000)
Income (Loss) Before Income Taxes								2,251,000			(26,483,000)	(5,318,000)
Restatement adjustments | Revenue recognition adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								14,656,000			(27,059,000)	(415,000)
Income (Loss) Before Income Taxes								3,111,000			(9,215,000)	(2,700,000)
Restatement adjustments | Product development cost
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								0			0
Income (Loss) Before Income Taxes								123,000			(1,001,000)	(2,397,000)	$ (3,600,000)
Restatement adjustments | Inventory valuation
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								0			0
Income (Loss) Before Income Taxes								(404,000)			(1,069,000)	38,000	(1,500,000)
Restatement adjustments | Impairment of long-lived assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								0			0
Income (Loss) Before Income Taxes								(557,000)			(11,733,000)	(310,000)
Restatement adjustments | Product warranty
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								0			0
Income (Loss) Before Income Taxes								(319,000)			(2,484,000)	591,000
Restatement adjustments | Accrued liabilities
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								0			0
Income (Loss) Before Income Taxes								422,000			(1,106,000)	591,000	300,000
Restatement adjustments | Purchase accounting
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales											0	0
Income (Loss) Before Income Taxes											0	(845,000)
Restatement adjustments | Equity investment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales								0			0	0
Income (Loss) Before Income 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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