CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues	$ 49,173	$ 50,443
Cost of revenues	15,433	17,270
Amortization of acquired intangible assets	446	431
Gross profit	33,294	32,742
Operating expenses:
Research and development	4,181	3,682
Sales and marketing	18,059	18,495
General and administrative	14,222	11,130
Amortization of acquired intangible assets	758	793
Restructuring expenses	776	0
Total operating expenses	37,996	34,100
Operating loss	(4,702)	(1,358)
Other income (expense):
Interest income	3	2
Interest expense	(1,688)	(695)
Other income (expense), net	383	(650)
Total other income (expense)	(1,302)	(1,343)
Pretax net loss	(6,004)	(2,701)
Income tax provision (benefit)	669	(52)
Net loss	$ (6,673)	$ (2,649)
Net loss per common share:
Basic and diluted net loss per share (In dollars per share)	$ (0.07)	$ (0.03)
Weighted-average shares used in computing net loss per share:
Basic and diluted (in shares)	96,838	95,826