Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 28,416	$ 26,686
Cost of revenue	22,735	20,578
Gross profit	5,681	6,108
Operating expenses:
Selling, general and administrative	9,572	9,592
Research and development	5,532	4,706
Restructuring and exit costs	(57)	997
Total operating expenses	15,047	15,295
Loss from operations	(9,366)	(9,187)
Interest expense, net	993	63
Other components of defined benefit plans, net	(221)	(155)
Other income	0	(1)
Foreign currency exchange loss, net	89	97
Loss before income taxes	(10,227)	(9,191)
Income tax provision (benefit)	(1,022)	1,208
Net loss	$ (9,205)	$ (10,399)
Net loss per share
Basic and diluted (in dollars per share)	$ (0.25)	$ (0.32)
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic and Diluted	37,522	32,197