Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 119,434	$ 126,526	$ 184,947
Cost of sales	82,028	81,626	128,699
Gross profit	37,406	44,900	56,248
Operating expenses:
Research, development and engineering	16,915	22,328	26,189
Selling, general and administrative	27,842	36,786	44,720
Restructuring charges	3,662	5,070	1,889
Total operating expenses	48,419	64,184	72,798
Loss from operations	(11,013)	(19,284)	(16,550)
Interest income (expense), net	(494)	133	107
Other income (expense), net	(10)	316	163
Loss before income taxes	(11,517)	(18,835)	(16,280)
Provision for (benefit from) income taxes	(542)	484	1,670
Net loss	$ (10,975)	$ (19,319)	$ (17,950)
Net income (loss) per share:
Basic and diluted (in usd per share)	$ (0.19)	$ (0.33)	$ (0.32)
Shares used in computing net loss per share:
Basic and Diluted (in shares)	58,944	58,538	55,299