CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net revenue	$ 67,697	$ 59,694	$ 128,818	$ 117,268
Cost of revenue	38,620	33,882	77,118	66,458
Gross profit	29,077	25,812	51,700	50,810
Operating expenses:
Sales and marketing	15,367	14,169	30,175	27,646
Research and development	6,794	4,298	13,042	8,879
General and administrative	10,783	10,564	22,004	20,639
Total operating expenses	32,944	29,031	65,221	57,164
Loss from operations	(3,867)	(3,219)	(13,521)	(6,354)
Other expense, net	(295)	(333)	(403)	(424)
Loss before income taxes	(4,162)	(3,552)	(13,924)	(6,778)
Income tax provision	744	33,217	1,437	31,267
Net loss	$ (4,906)	$ (36,769)	$ (15,361)	$ (38,045)
Net loss per common share:
Basic (in dollars per share)	$ (0.06)	$ (0.50)	$ (0.20)	$ (0.52)
Diluted (in dollars per share)	$ (0.06)	$ (0.50)	$ (0.20)	$ (0.52)
Weighted-average shares used in computing net loss per common share:
Basic (in shares)	77,275	74,172	76,447	73,654
Diluted (in shares)	77,275	74,172	76,447	73,654