Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Net sales	$ 34,884	$ 51,259	$ 85,388	$ 98,308
Cost of sales	21,629	37,275	55,199	71,443
Gross profit	13,255	13,984	30,189	26,865
Operating expenses:
Research, development and engineering	5,791	6,645	12,421	13,160
Selling, general and administrative	9,705	11,380	20,572	22,892
Restructuring charges	831	(13)	1,551	(78)
Total operating expenses	16,327	18,012	34,544	35,974
Loss from operations	(3,072)	(4,028)	(4,355)	(9,109)
Interest income (expense), net	39	58	70	37
Other income (expense), net	(277)	(969)	105	(2,475)
Loss before income taxes	(3,310)	(4,939)	(4,180)	(11,547)
Provision for (benefit from) income taxes	36	274	285	(60)
Net loss	$ (3,346)	$ (5,213)	$ (4,465)	$ (11,487)
Net loss per share:
Basic and diluted (in usd per share)	$ (0.06)	$ (0.10)	$ (0.08)	$ (0.22)
Shares used in computing net loss per share:
Basic and Diluted (in shares)	58,507	54,550	58,463	52,395