Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 35,816	$ 25,506	$ 99,605	$ 94,844
Cost of revenue	28,420	17,878	78,191	67,582
Gross profit	7,396	7,628	21,414	27,262
Operating expenses:
Selling, general and administrative	14,514	8,374	36,124	26,695
Research and development	4,891	5,038	14,007	16,106
Restructuring and exit costs	1,251	0	2,248	297
Impairment of assets	0	155	0	155
Total operating expenses	20,656	13,567	52,379	43,253
Loss from operations	(13,260)	(5,939)	(30,965)	(15,991)
Gain on sale of product line	0	0	0	(6,657)
Interest expense, net	152	48	312	179
Other income	(14)	(5)	(67)	(136)
Foreign currency exchange (gain) loss, net	(65)	49	50	252
Loss before income taxes	(13,333)	(6,031)	(31,260)	(9,629)
Income tax provision	527	824	3,117	1,907
Net loss	$ (13,860)	$ (6,855)	$ (34,377)	$ (11,536)
Net loss per share
Basic and diluted (in dollars per share)	$ (0.37)	$ (0.21)	$ (0.98)	$ (0.36)
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic and Diluted	37,008	31,989	34,929	31,828