Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Revenues	$ 59,490	$ 50,987	$ 167,913	$ 145,701
Cost of revenues	12,728	11,465	37,175	31,276
Gross profit	46,762	39,522	130,738	114,425
Operating expenses:
Research and development	10,892	9,756	31,240	27,353
Sales and marketing	15,475	14,498	46,872	43,393
General and administrative	9,546	7,281	25,112	22,383
Total operating expenses	35,913	31,535	103,224	93,129
Income from operations	10,849	7,987	27,514	21,296
Other income (expense), net:
Interest expense	0	(9)	(3)	(23)
Interest income	753	363	1,775	903
Other expense, net	(82)	(124)	(288)	(442)
Total other income (expense), net	671	230	1,484	438
Income before income taxes	11,520	8,217	28,998	21,734
(Benefit from) provision for income taxes	3,068	3,221	(8,586)	8,417
Net income	$ 8,452	$ 4,996	$ 37,584	$ 13,317
Net income per share:
Basic (USD per share)	$ 0.22	$ 0.14	$ 1.01	$ 0.38
Diluted (USD per share)	$ 0.21	$ 0.13	$ 0.95	$ 0.35
Weighted average shares used in computing net income per share:
Basic (shares)	37,703	35,477	37,162	35,074
Diluted (shares)	40,299	38,712	39,601	38,205