Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Net revenues:
Products	$ 54,227	$ 43,404	$ 108,210	$ 71,952
Service	10,145	7,431	18,305	16,048
Total net revenues	64,372	50,835	126,515	88,000
Costs of net revenues:
Cost of products	23,334	18,408	45,981	30,884
Cost of service	4,934	4,421	9,275	8,563
Total costs of net revenues	28,268	22,829	55,256	39,447
Gross profit	36,104	28,006	71,259	48,553
Operating expenses:
Research and development	5,779	4,931	11,267	9,501
Selling	6,997	5,372	13,696	10,089
General and administrative	5,442	4,357	10,941	8,938
Amortization of intangible assets	401	410	807	799
Asset impairment	0	44	0	388
Total operating expenses	18,619	15,114	36,711	29,715
Income from operations	17,485	12,892	34,548	18,838
Other income (expense)
Interest income	65	27	105	48
Interest expense	(341)	(384)	(678)	(837)
Other, net	(470)	222	(983)	758
Total other income (expense), net	(746)	(135)	(1,556)	(31)
Income before income taxes	16,739	12,757	32,992	18,807
Provision for income taxes	5,652	1,190	11,395	1,314
Net income	$ 11,087	$ 11,567	$ 21,597	$ 17,493
Net income per share:
Basic	$ 0.49	$ 0.53	$ 0.95	$ 0.81
Diluted	$ 0.47	$ 0.51	$ 0.92	$ 0.77
Shares used in per share calculation:
Basic	22,709	21,672	22,637	21,605
Diluted	23,442	22,847	23,422	22,751