Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Net revenues:
Products	$ 143,827	$ 194,774	$ 154,548
Service	39,054	35,287	33,517
Total net revenues	182,881	230,061	188,065
Costs of net revenues:
Cost of products	75,878	88,579	66,484
Cost of service	20,526	18,304	19,328
Amortization of intangible assets	2,549	1,077	861
Total costs of net revenues	98,953	107,960	86,673
Gross profit	83,928	122,101	101,392
Operating expenses:
Research and development	29,585	23,290	18,973
Selling	26,457	27,019	21,320
General and administrative	21,632	22,901	18,617
Amortization of intangible assets	776	625	695
Asset impairment	0	0	463
Legal settlement	0	2,500	0
Total operating expenses	78,450	76,335	60,068
Income from operations	5,478	45,766	41,324
Other expense
Interest income	133	220	107
Interest expense	(1,040)	(1,336)	(1,556)
Other income (expense), net	48	(66)	814
Total other expense, net	(859)	(1,182)	(635)
Income before income taxes	4,619	44,584	40,689
Provision for (benefit from) income taxes	154	15,899	(15,259)
Net income	4,465	28,685	55,948
Other comprehensive income:
Unrealized loss, net of tax	(2)	0	0
Employee benefit plan adjustment	(11)	(39)	(51)
Foreign currency translation gain (loss)	(264)	(484)	750
Total Comprehensive Income	$ 4,188	$ 28,162	$ 56,647
Net income per share:
Basic	$ 0.19	$ 1.26	$ 2.56
Diluted	$ 0.19	$ 1.22	$ 2.43
Shares used in per share calculation:
Basic	23,358	22,743	21,855
Diluted	23,845	23,480	22,998