Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Condensed Consolidated Statements of Operations [Abstract]
Product revenue	$ 121,954	$ 90,597	$ 354,977	$ 249,292
Service revenue	16,917	14,187	50,725	35,857
Net revenue	138,871	104,784	405,702	285,149
Product cost of revenue	62,257	50,305	181,690	133,208
Service cost of revenue	7,207	4,233	20,289	11,044
Amortization of intangibles	5,446	2,714	16,079	6,878
Total cost of revenue	74,910	57,252	218,058	151,130
Gross profit	63,961	47,532	187,644	134,019
Operating expenses:
Research and development	25,638	19,002	77,449	52,946
Selling, general and administrative	32,254	25,999	98,361	70,917
Amortization of intangibles	2,229	959	6,688	2,026
Total operating expenses	60,121	45,960	182,498	125,889
Income from operations	3,840	1,572	5,146	8,130
Interest income, net	90	165	256	974
Other income (expense), net	381	(405)	(25)	(903)
Income before income taxes	4,311	1,332	5,377	8,201
Provision for (benefit from) income taxes	765	1,693	925	(1,202)
Net income (loss)	$ 3,546	$ (361)	$ 4,452	$ 9,403
Net income (loss) per share:
Basic	$ 0.03	$ 0.00	$ 0.04	$ 0.10
Diluted	$ 0.03	$ 0.00	$ 0.04	$ 0.10
Weighted average shares:
Basic	115,791	100,246	114,855	97,975
Diluted	116,208	100,246	116,005	98,672