Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jun. 27, 2010	Jul. 03, 2011	Jun. 27, 2010
Condensed Consolidated Statements of Operations
Net sales	$ 51,259	$ 32,120	$ 98,308	$ 57,315
Cost of sales	35,852	22,194	68,957	39,627
Gross margin	15,407	9,926	29,351	17,688
Operating expenses:
Research, development and engineering	6,645	7,059	13,160	13,465
Selling, general and administrative	12,803	12,558	25,378	24,931
Restructuring charges	(13)	(93)	(78)	(77)
Total operating expenses	19,435	19,524	38,460	38,319
Loss from operations	(4,028)	(9,598)	(9,109)	(20,631)
Interest income	58	30	85	60
Interest expense	0	(30)	(48)	(62)
Other income (expense), net	(969)	1,425	(2,475)	1,883
Loss before income taxes	(4,939)	(8,173)	(11,547)	(18,750)
Provision for (benefit from) income taxes	274	207	(60)	386
Net loss	$ (5,213)	$ (8,380)	$ (11,487)	$ (19,136)
Net loss per share:
Basic and diluted	$ (0.10)	$ (0.17)	$ (0.22)	$ (0.38)
Shares used in computing net loss per share:
Basic and diluted	54,550	50,052	52,395	50,018