Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Net revenues:
Products	$ 47,858	$ 53,983
Service	7,634	8,160
Total net revenues	55,492	62,143
Costs of net revenues:
Cost of products	24,819	22,647
Cost of service	4,970	4,341
Amortization of intangibles assets	637	232
Total costs of net revenues	30,426	27,220
Gross profit	25,066	34,923
Operating expenses:
Research and development	7,476	5,488
Selling	7,211	6,699
General and administrative	6,081	5,499
Amortization of intangible assets	192	174
Total operating expenses	20,960	17,860
Income (loss) from operations	4,106	17,063
Other income (expense)
Interest income	52	40
Interest expense	(269)	(337)
Other, net	(175)	(513)
Total other income (expense), net	(392)	(810)
Income (loss) before income taxes	3,714	16,253
Provision (benefit) for income taxes	2,011	5,743
Net income (loss)	1,703	10,510
Other Comprehensive Income:
Foreign currency translation gain	246	334
Comprehensive Income	$ 1,949	$ 10,844
Net income (loss) per share:
Basic (in dollars per share)	$ 0.07	$ 0.47
Diluted (in dollars per share)	$ 0.07	$ 0.45
Shares used in per share calculation:
Basic (in shares)	23,349	22,568
Diluted (in shares)	23,981	23,397