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Restatement of Previously Issued Consolidated Financial Statements - Narrative (Details) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($) board_member	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2017 USD ($) board_member	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) board_member	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reduction to stockholders' equity balances	$ (32,172)	$ (6,129)	$ (18,210)	$ (30,048)	$ (40,660)	$ (46,967)	$ (55,337)	$ (81,900)	$ (18,210)	$ (55,337)	$ (6,129)	$ (46,967)	$ (32,172)	$ (40,660)	$ (84,873)	$ (86,483)	$ (47,607)
Net (loss) income	(6,130)	(9,202)	(7,747)	(24,533)	(6,640)	(8,717)	(28,792)	(3,323)	(32,280)	(32,115)	(41,482)	(40,832)	(47,612)	(47,472)	(2,891)	21,477
Net sales	131,476	99,953	100,922	84,265	98,280	78,944	85,771	76,470					416,616	339,465	362,387	347,580
(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
Impairment losses													0	0	(11,633)	0
Asset impairment charges	1	0	0	0	167	38	1,064	345					1	1,614	11,686	310
Goodwill	$ 29,835	$ 29,835	$ 29,835	$ 29,835	$ 29,835	$ 29,835	$ 29,835	29,835	$ 29,835	$ 29,835	$ 29,835	$ 29,835	$ 29,835	$ 29,835	$ 29,835	23,414	0
Ownership interest of nonconsolidated subsidiary															9.00%
Number of board member positions held | board_member															2
Number of board members | board_member	3												3		5
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reduction to stockholders' equity balances								19,467							$ 21,424	4,316	2,891
Net (loss) income								1,928							(17,169)	(2,249)
Net sales								14,656							(27,059)	(415)
(Loss) income before taxes								2,251							(26,483)	(5,318)
Cost of sales															6,500	7,900
Asset impairment charges								345							11,686	310
Goodwill								(11,631)							(11,631)	(132)
Revenue recognition adjustments | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								14,656							(27,059)	(415)
(Loss) income before taxes								3,111							(9,215)	(2,700)
Gross basis | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales															6,500	7,900
Product development cost | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0							0
(Loss) income before taxes								123							(1,001)	(2,397)	(3,600)
Inventory valuation | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0							0
(Loss) income before taxes								(404)							(1,069)	38	$ (1,500)
Impairment of long-lived assets | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0							0
(Loss) income before taxes								(557)							(11,733)	(310)
Asset impairment charges															100	300
Product warranty | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales								0							0
(Loss) income before taxes								$ (319)							(2,484)	591
Purchase accounting | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales															0	0
(Loss) income before taxes															$ 0	(845)
Increase in long-lived assets																700
Goodwill																$ 700

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