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
Revenues [Abstract]
Revenues	$ 26,291	$ 22,190	$ 51,174	$ 43,381
Cost of revenues	5,924	4,629	11,719	8,789
Gross profit	20,367	17,561	39,455	34,592
Operating expenses:
Research and development	5,291	5,148	10,588	10,249
Sales and marketing	10,160	9,784	20,328	19,030
General and administrative	4,053	2,843	7,949	5,657
Total operating expenses	19,504	17,775	38,865	34,936
Income (loss) from operations	863	(214)	590	(344)
Other income (expense), net:
Interest expense	(12)	(50)	(30)	(115)
Interest income	81	1	158	1
Other income (expense), net	33	(92)	(286)	(104)
Total other income (expense), net	102	(141)	(158)	(218)
Income (loss) before provision for (benefit from) income taxes	965	(355)	432	(562)
Provision for (benefit from) income taxes	92	(78)	162	0
Net income (loss)	873	(277)	270	(562)
Net income (loss) attributable to common stockholders	$ 872	$ (277)	$ 270	$ (562)
Net income (loss) per share attributable to common stockholders:
Basic (USD per share)	$ 0.03	$ (0.05)	$ 0.01	$ (0.10)
Diluted (USD per share)	$ 0.02	$ (0.05)	$ 0.01	$ (0.10)
Weighted average shares used in computing net income (loss) per share attributable to common stockholders:
Basic (shares)	31,777	5,515	31,636	5,392
Diluted (shares)	35,393	5,515	35,353	5,392