CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues	$ 28,939	$ 23,752
Cost of revenues	9,255	7,066
Gross profit	19,684	16,686
Operating expenses
Sales and marketing	10,884	9,225
Research and development	2,974	2,503
General and administrative	4,511	4,047
Amortization of intangible assets	717	717
Total operating expenses	19,086	16,492
Income from operations	598	194
Other income (expense)
Interest income	49	23
Other expense	(56)	(84)
Total other expense, net	(7)	(61)
Income before income taxes	591	133
Income tax (expense) benefit	(218)	66
Net income	$ 373	$ 199
Net income per share
Basic	$ 0.02	$ 0.01
Diluted	$ 0.02	$ 0.01
Weighted average common shares used to compute net income per share
Basic	16,155	14,884
Diluted	16,830	15,564