Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Net revenues:
Products	$ 49,839	$ 44,403	$ 158,049	$ 116,355
Service	8,430	9,532	26,735	25,580
Total net revenues	58,269	53,935	184,784	141,935
Costs of net revenues:
Cost of products	22,881	19,159	68,862	50,043
Cost of service	4,589	5,379	13,864	13,941
Total costs of net revenues	27,470	24,538	82,726	63,984
Gross profit	30,799	29,397	102,058	77,951
Operating expenses:
Research and development	6,045	4,601	17,312	14,101
Selling	6,862	5,734	20,558	15,822
General and administrative	5,817	4,801	16,758	13,740
Amortization of intangible assets	329	368	1,136	1,168
Asset impairment	0	75	0	463
Total operating expenses	19,053	15,579	55,764	45,294
Income from operations	11,746	13,818	46,294	32,657
Other income (expense)
Interest income	57	31	162	78
Interest expense	(324)	(355)	(1,002)	(1,192)
Other, net	834	(53)	(149)	705
Total other income (expense), net	567	(377)	(989)	(409)
Income before income taxes	12,313	13,441	45,305	32,248
Provision for income taxes	4,694	1,114	16,089	2,428
Net income	$ 7,619	$ 12,327	$ 29,216	$ 29,820
Net income per share:
Basic (in dollars per share)	$ 0.33	$ 0.56	$ 1.29	$ 1.37
Diluted (in dollars per share)	$ 0.32	$ 0.53	$ 1.24	$ 1.30
Basic (in shares)	22,875	21,978	22,715	21,729
Diluted (in shares)	23,526	23,168	23,489	22,890