Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Condensed Consolidated Statements of Operations [Abstract]
Product revenue	$ 113,555	$ 117,156	$ 223,922	$ 233,023
Service revenue	19,079	16,840	36,433	33,808
Net revenue	132,634	133,996	260,355	266,831
Product cost of revenue	64,266	62,712	128,576	125,234
Service cost of revenue	10,790	9,456	20,539	17,914
Total cost of revenue	75,056	72,168	149,115	143,148
Gross profit	57,578	61,828	111,240	123,683
Operating expenses:
Research and development	25,641	25,662	53,470	51,811
Selling, general and administrative	32,142	32,543	64,453	66,107
Amortization of intangibles	2,190	2,230	4,369	4,459
Total operating expenses	59,973	60,435	122,292	122,377
Income (loss) from operations	(2,395)	1,393	(11,052)	1,306
Interest income, net	116	74	235	166
Other income (expense), net	(120)	(299)	283	(406)
Income (loss) before income taxes	(2,399)	1,168	(10,534)	1,066
Provision for (benefit from) income taxes	(2,416)	778	(3,023)	160
Net income (loss)	$ 17	$ 390	$ (7,511)	$ 906
Net income (loss) per share:
Basic	$ 0.00	$ 0.00	$ (0.06)	$ 0.01
Diluted	$ 0.00	$ 0.00	$ (0.06)	$ 0.01
Weighted average shares:
Basic	117,056	114,939	117,162	114,387
Diluted	117,493	116,298	117,162	116,143