Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Product revenues	$ 242,515	$ 247,058	$ 740,066	$ 780,611
Service revenues	93,946	88,334	280,381	258,991
Total revenues	336,461	335,392	1,020,447	1,039,602
Cost of revenues:
Cost of product revenues	102,830	102,235	309,994	316,863
Cost of service revenues	38,587	36,799	114,714	106,123
Total cost of revenues	141,417	139,034	424,708	422,986
Gross profit	195,044	196,358	595,739	616,616
Operating expenses:
Sales and marketing	107,292	117,853	325,663	348,041
Research and development	54,220	53,997	164,782	153,425
General and administrative	28,468	27,376	76,461	72,375
Amortization of purchased intangibles	2,487	2,512	7,535	7,318
Restructuring costs	24,887	6,171	34,639	21,829
Acquisition-related costs	39	6,334	3,411	11,793
Total operating expenses	217,393	214,243	612,491	614,781
Operating income (loss)	(22,349)	(17,885)	(16,752)	1,835
Interest and other income (expense), net:
Interest expense	(850)	(287)	(1,736)	(470)
Other income (expense)	(784)	57	(1,041)	(2,540)
Interest and other income (expense), net	(1,634)	(230)	(2,777)	(3,010)
Loss from continuing operations before provision for (benefit from) income taxes	(23,983)	(18,115)	(19,529)	(1,175)
Provision for (benefit from) income taxes	(5)	(2,709)	(2,963)	105
Net loss from continuing operations	(23,978)	(15,406)	(16,566)	(1,280)
Income from discontinued operations, net of taxes		645		7,710
Gain from sale of discontinued operations, net of taxes			459
Net income (loss)	$ (23,978)	$ (14,761)	$ (16,107)	$ 6,430
Net income (loss) per share, basic and diluted:
Net loss per share from continuing operations	$ (0.14)	$ (0.09)	$ (0.10)	$ (0.01)
Income per share from discontinued operations, net of taxes				$ 0.04
Gain per share from sale of discontinued operations, net of taxes
Net income (loss) per share, basic and diluted	$ (0.14)	$ (0.08)	$ (0.09)	$ 0.04
Number of shares used in computation of net income (loss) per share, basic and diluted	170,310	176,847	172,644	177,331