Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Net revenues:
Products	$ 194,774	$ 154,548	$ 49,153
Service	35,287	33,517	27,554
Total net revenues	230,061	188,065	76,707
Costs of net revenues:
Cost of products	88,579	66,484	26,594
Cost of service	18,304	19,328	13,992
Total costs of net revenues	106,883	85,812	40,586
Gross profit	123,178	102,253	36,121
Operating expenses:
Research and development	23,290	18,973	14,672
Selling	27,019	21,320	15,072
General and administrative	22,901	18,617	15,168
Amortization of intangible assets	1,702	1,556	1,535
Restructuring charge	0	0	1,134
Legal settlement	2,500	0	0
Asset impairment	0	463	1,899
Total operating expenses	77,412	60,929	49,480
Income (loss) from operations	45,766	41,324	(13,359)
Other income (expense)
Interest income	220	107	53
Interest expense	(1,336)	(1,556)	(1,658)
Other, net	(66)	814	(1,927)
Total other income (expense), net	(1,182)	(635)	(3,532)
Income (loss) before income taxes	44,584	40,689	(16,891)
Provision (benefit) for income taxes	15,899	(15,259)	(586)
Net income (loss)	$ 28,685	$ 55,948	$ (16,305)
Net income (loss) per share:
Basic (in dollars per share)	$ 1.26	$ 2.56	$ (0.87)
Diluted (in dollars per share)	$ 1.22	$ 2.43	$ (0.87)
Basic (in shares)	22,743	21,855	18,639
Diluted (in shares)	23,480	22,998	18,639