Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Net revenues:
Products	$ 32,314	$ 49,839	$ 121,728	$ 158,049
Service	11,624	8,430	30,883	26,735
Total net revenues	43,938	58,269	152,611	184,784
Costs of net revenues:
Cost of products	15,778	22,881	63,224	68,862
Cost of service	5,379	4,589	15,507	13,864
Amortization of intangible assets	629	203	1,903	667
Total costs of net revenues	21,786	27,673	80,634	83,393
Gross profit	22,152	30,596	71,977	101,391
Operating expenses:
Research and development	7,176	6,045	22,296	17,312
Selling	6,308	6,862	20,560	20,558
General and administrative	4,861	5,817	16,525	16,758
Amortization of intangible assets	193	126	580	469
Total operating expenses	18,538	18,850	59,961	55,097
Income from operations	3,614	11,746	12,016	46,294
Other income (expense)
Interest income	28	57	113	162
Interest expense	(262)	(324)	(795)	(1,002)
Other, net	(121)	834	(345)	(149)
Total other expense, net	(355)	567	(1,027)	(989)
Income before income taxes	3,259	12,313	10,989	45,305
Provision for income taxes	1,356	4,694	2,877	16,089
Net income	1,903	7,619	8,112	29,216
Other comprehensive income:
Unrealized gains (losses)	1	0	(3)	0
Foreign currency translation gains (losses)	1,108	(783)	190	590
Comprehensive income	$ 3,012	$ 6,836	$ 8,299	$ 29,806
Net income per share:
Basic	$ 0.08	$ 0.33	$ 0.35	$ 1.29
Diluted	$ 0.08	$ 0.32	$ 0.34	$ 1.24
Shares used in per share calculation:
Basic	23,310	22,875	23,351	22,715
Diluted	23,760	23,526	23,874	23,489