CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (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
Income Statement [Abstract]
Revenues	$ 25,658	$ 17,821	$ 49,410	$ 34,355
Cost of revenues	7,943	4,843	15,009	9,291
Gross profit	17,715	12,978	34,401	25,064
Operating expenses
Sales and marketing	9,647	6,972	18,872	13,419
Research and development	2,657	1,830	5,160	3,562
General and administrative	4,211	3,165	8,258	6,353
Amortization of intangible assets	717	260	1,434	520
Total operating expenses	17,232	12,227	33,724	23,854
Income from operations	483	751	677	1,210
Other income (expense)
Interest income	22	13	45	28
Other expense	(48)	(38)	(132)	(103)
Total other expense, net	(26)	(25)	(87)	(75)
Income before income taxes	457	726	590	1,135
Income tax expense	(169)	(300)	(103)	(453)
Net income	$ 288	$ 426	$ 487	$ 682
Net income per share
Basic	$ 0.02	$ 0.03	$ 0.03	$ 0.06
Diluted	$ 0.02	$ 0.03	$ 0.03	$ 0.05
Weighted average common shares used to compute net income per share
Basic	15,076	12,284	14,983	12,224
Diluted	15,785	13,026	15,677	13,106