CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenues	$ 204,724	$ 196,278	$ 197,711
Cost of revenues	78,669	70,761	79,168
Amortization of acquired intangible assets	1,733	1,749	1,613
Gross profit	124,322	123,768	116,930
Operating expenses:
Research and development	14,190	14,886	16,888
In-process research and development	0	341	0
Sales and marketing	76,960	75,177	75,189
General and administrative	47,949	39,939	36,367
Amortization of acquired intangible assets	3,009	2,180	2,152
Transaction related expenses	0	1,082	0
Restructuring expenses	9,665	0	1,050
Litigation settlement expenses	45,982	0	9,800
Total operating expenses	197,755	133,605	141,446
Operating loss	(73,433)	(9,837)	(24,516)
Other income (expense):
Interest income	6	118	148
Interest expense	(3,959)	(6,105)	(3,027)
Other income (expense), net	(1,662)	(794)	707
Total other income (expense)	(5,615)	(6,781)	(2,172)
Pretax net loss	(79,048)	(16,618)	(26,688)
Income tax provision (benefit)	3,179	(1,159)	(4,507)
Net loss	$ (82,227)	$ (15,459)	$ (22,181)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.85)	$ (0.17)	$ (0.25)
Weighted-average shares used in computing net loss per share:
Basic and diluted (in shares)	96,235	90,218	88,798