Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 45,599	$ 36,970
Cost of revenues	14,881	11,572
Gross profit	30,718	25,398
Operating expenses
Sales and marketing	15,889	13,744
Research and development	5,069	4,069
General and administrative	7,285	5,818
Amortization of intangible assets	1,161	845
Total operating expenses	29,404	24,476
Income from operations	1,314	922
Other income (expense)
Interest income, net	145	37
Other income (expense), net	293	(112)
Total other income (expense), net	438	(75)
Income before income taxes	1,752	847
Income tax expense	(708)	(261)
Net income	$ 1,044	$ 586
Net income per share
Basic	$ 0.06	$ 0.04
Diluted	$ 0.06	$ 0.03
Weighted average common shares used to compute net income per share
Basic	16,783	16,433
Diluted	17,029	17,011
Other comprehensive income (loss)
Foreign currency translation adjustments	$ 2,821	$ (1,299)
Unrealized gain on investments	75
Comprehensive income (loss)	$ 3,940	$ (713)