CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 44,761	$ 48,647
Cost of revenues	13,532	15,335
Amortization of acquired intangible assets	360	369
Gross profit	30,869	32,943
Operating expenses:
Research and development	3,667	3,851
Sales and marketing	19,122	18,195
General and administrative	10,647	9,138
Amortization of acquired intangible assets	486	677
Restructuring expenses	686	(60)
Total operating expenses	34,608	31,801
Operating (loss) income	(3,739)	1,142
Other income (expense):
Interest income	20	7
Interest expense	(3,357)	(3,371)
Other income (expense), net	1,045	(1,437)
Total other income (expense)	(2,292)	(4,801)
Pretax net loss	(6,031)	(3,659)
Income tax provision	586	902
Net loss	$ (6,617)	$ (4,561)
Net loss per basic and diluted share	$ (0.07)	$ (0.05)
Shares used in calculating basic and diluted net loss per share	101,586	99,020