Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenues	$ 47,351	$ 38,846	$ 92,950	$ 75,816
Cost of revenues	15,972	12,335	30,853	23,907
Gross profit	31,379	26,511	62,097	51,909
Operating expenses
Sales and marketing	16,677	14,101	32,566	27,845
Research and development	5,542	4,495	10,611	8,564
General and administrative	7,082	6,055	14,367	11,873
Amortization of intangible assets	1,198	833	2,359	1,678
Total operating expenses	30,499	25,484	59,903	49,960
Income from operations	880	1,027	2,194	1,949
Other income (expense)
Interest income, net	151	37	296	74
Other expense, net	(374)	(57)	(81)	(169)
Total other income (expense), net	(223)	(20)	215	(95)
Income before income taxes	657	1,007	2,409	1,854
Income tax expense	(305)	(356)	(1,013)	(617)
Net income	$ 352	$ 651	$ 1,396	$ 1,237
Net income per share
Basic	$ 0.02	$ 0.04	$ 0.08	$ 0.08
Diluted	$ 0.02	$ 0.04	$ 0.08	$ 0.07
Weighted average common shares used to compute net income per share
Basic	16,909	16,536	16,873	16,485
Diluted	17,120	16,998	17,100	17,043
Other comprehensive income (loss)
Foreign currency translation adjustments	$ (856)	$ (1,278)	$ 1,965	$ (2,577)
Unrealized gain on investments	24	6	99	6
Comprehensive income (loss)	$ (480)	$ (621)	$ 3,460	$ (1,334)