Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Revenue:
Product	$ 33,520	$ 41,892	$ 107,517	$ 107,291
Service	23,529	24,461	71,481	78,133
Total revenue	57,049	66,353	178,998	185,424
Cost of revenue:
Product	11,768	11,504	31,988	44,283
Service	12,839	12,633	40,019	42,364
Total cost of revenue	24,607	24,137	72,007	86,647
Gross profit	32,442	42,216	106,991	98,777
Operating expenses:
Research and development	15,612	16,231	51,094	47,026
Sales and marketing	17,613	14,651	56,339	42,246
General and administrative	7,939	10,133	25,302	26,526
Acquisition-related	4,090		5,057
Restructuring	1,992		1,992
Total operating expenses	47,246	41,015	139,784	115,798
Income (loss) from operations	(14,804)	1,201	(32,793)	(17,021)
Interest income, net	20	269	457	1,036
Other expense, net	(2)		(2)
Income (loss) before income taxes	(14,786)	1,470	(32,338)	(15,985)
Income tax (provision) benefit	(833)	439	(1,444)	(448)
Net income (loss)	$ (15,619)	$ 1,909	$ (33,782)	$ (16,433)
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.06)	$ 0.01	$ (0.12)	$ (0.06)
Diluted (in dollars per share)	$ (0.06)	$ 0.01	$ (0.12)	$ (0.06)
Shares used to compute earnings (loss) per share:
Basic (in shares)	280,145	278,721	279,854	278,286
Diluted (in shares)	280,145	279,324	279,854	278,286