Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Net sales	$ 33,840	$ 20,398	$ 78,651	$ 105,786
Cost of sales	22,416	12,664	54,392	67,863
Gross profit	11,424	7,734	24,259	37,923
Operating expenses:
Research, development and engineering	4,082	5,217	12,565	17,638
Selling, general and administrative	6,572	8,205	21,074	28,777
Restructuring charges	1,000	453	3,662	2,004
Total operating expenses	11,654	13,875	37,301	48,419
Loss from operations	(230)	(6,141)	(13,042)	(10,496)
Interest income (expense), net	(163)	36	(284)	106
Other income (expense), net	(35)	(45)	(111)	60
Loss before income taxes	(428)	(6,150)	(13,437)	(10,330)
Provision for (benefit from) income taxes	(16)	(116)	50	169
Net loss	$ (412)	$ (6,034)	$ (13,487)	$ (10,499)
Net loss per share:
Basic and diluted (in usd per share)	$ (0.01)	$ (0.10)	$ (0.23)	$ (0.18)
Shares used in computing net loss per share:
Basic and Diluted (in shares)	59,024	58,586	58,881	58,504