Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 15,438	$ 23,002
Cost of revenue	16,966	19,684
Gross profit (loss)	(1,528)	3,318
Operating expenses:
Selling, general and administrative	9,700	7,783
Research and development	5,165	4,908
Restructuring and exit costs	0	(57)
Total operating expenses	14,865	12,634
Loss from operations	(16,393)	(9,316)
Interest expense	1,140	1,063
Other components of defined benefit plans, net	26	29
Other income	(137)	(71)
Foreign currency exchange loss, net	184	51
Loss from continuing operations before income taxes	(17,606)	(10,388)
Income tax provision	14	126
Loss from continuing operations	(17,620)	(10,514)
Income from discontinued operations, net of income taxes	0	1,309
Net loss	$ (17,620)	$ (9,205)
Net income (loss) per share - basic and diluted:
Continuing operations	$ (0.38)	$ (0.28)
Discontinued operations	0.00	0.03
Basic and diluted (in dollars per share)	$ (0.38)	$ (0.25)
Weighted average common shares outstanding:
Weighted average common shares outstanding, basic and diluted	46,220	37,522