Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 37,103	$ 34,135	$ 63,789	$ 69,338
Cost of revenue	29,276	24,154	49,771	49,704
Gross profit	7,827	9,981	14,018	19,634
Operating expenses:
Selling, general and administrative	12,070	8,223	21,610	18,321
Research and development	4,430	5,461	9,116	11,068
Restructuring and exit costs	0	109	997	297
Total operating expenses	16,500	13,793	31,723	29,686
Loss from operations	(8,673)	(3,812)	(17,705)	(10,052)
Gain on sale of product line	0	(6,657)	0	(6,657)
Interest expense, net	97	61	160	131
Other income	(52)	(47)	(53)	(131)
Foreign currency exchange loss, net	18	64	115	203
Income (loss) before income taxes	(8,736)	2,767	(17,927)	(3,598)
Income tax provision	1,382	600	2,590	1,083
Net income (loss)	$ (10,118)	$ 2,167	$ (20,517)	$ (4,681)
Net income (loss) per share
Basic and diluted (in dollars per share)	$ (0.28)	$ 0.07	$ (0.61)	$ (0.15)
Weighted average common shares outstanding:
Basic (in shares)	35,526	31,842	33,871	31,746
Diluted (in shares)	35,526	32,027	33,871	31,746