Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Revenues	$ 107,962	$ 91,420	$ 76,212
Cost of revenues	24,660	18,404	13,247
Gross profit	83,302	73,016	62,965
Operating expenses:
Research and development	21,678	20,195	19,633
Sales and marketing	42,523	37,738	31,526
General and administrative	16,792	12,079	8,900
Total operating expenses	80,993	70,012	60,059
Income from operations	2,309	3,004	2,906
Other income (expense), net:
Interest expense	(43)	(192)	(204)
Interest income	375	14	14
Other income (expense), net	(517)	(188)	(346)
Total other income (expense), net	(185)	(366)	(536)
Income before provision for income taxes	2,124	2,638	2,370
Provision for income taxes	500	358	416
Net income	1,624	2,280	1,954
Net income attributable to common stockholders	$ 1,622	$ 1,076	$ 436
Net income per share attributable to common stockholders:
Basic (usd per share)	$ 0.05	$ 0.09	$ 0.09
Diluted (in usd per share)	$ 0.05	$ 0.08	$ 0.08
Weighted average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	31,914	11,891	5,053
Diluted (in shares)	35,973	28,352	24,194