Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	[1]	$ 90,459	$ 87,709
Cost of revenue		80,459	82,407
Gross profit		10,000	5,302
Operating expenses:
Selling, general and administrative		30,542	38,186
Research and development		19,983	16,342
Restructuring and exit costs		(26)	2,232
Impairment of assets		218	240
Total operating expenses		50,717	57,000
Loss from operations		(40,717)	(51,698)
Interest expense		4,460	1,413
Other components of defined benefit plans, net		110	55
Other income		(228)	(105)
Foreign currency exchange loss, net		479	242
Loss from continuing operations before income taxes		(45,538)	(53,303)
Income tax provision (benefit)		(1,096)	559
Loss from continuing operations		(44,442)	(53,862)
Income from discontinued operations, net of income taxes		7,894	10,733
Net loss		$ (36,548)	$ (43,129)
Net income (loss) per share - basic and diluted:
Continuing operations (in dollars per share)		$ (1.08)	$ (1.52)
Discontinued operations (in dollars per share)		0.19	0.30
Net loss per share - basic and diluted (in dollars per share)		$ (0.89)	$ (1.22)
Weighted average common shares outstanding:
Basic and diluted		41,031	35,480

[1] Location is determined by shipment destination.