CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (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
Income Statement [Abstract]
Net revenue	$ 66,482	$ 59,090	$ 195,300	$ 176,358
Cost of revenue	39,730	34,544	116,848	101,002
Gross profit	26,752	24,546	78,452	75,356
Operating expenses:
Sales and marketing	13,731	13,512	43,906	41,158
Research and development	5,500	4,416	18,542	13,295
General and administrative	11,177	10,000	33,182	30,639
Total operating expenses	30,408	27,928	95,630	85,092
Loss from operations	(3,656)	(3,382)	(17,178)	(9,736)
Interest expense	(1,272)	(70)	(1,376)	(180)
Other, net	179	190	(119)	(124)
Loss before income taxes	(4,749)	(3,262)	(18,673)	(10,040)
Income tax provision	753	322	2,190	31,589
Net loss	$ (5,502)	$ (3,584)	$ (20,863)	$ (41,629)
Net loss per share, basic and diluted (in dollars per share)	$ (0.07)	$ (0.05)	$ (0.27)	$ (0.56)
Weighted average common shares outstanding, basic and diluted (in shares)	79,740	74,667	77,557	73,994