Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Revenues	$ 78,929	$ 68,153	$ 154,272	$ 133,031
Cost of revenues	17,537	16,248	35,246	32,149
Gross profit	61,392	51,905	119,026	100,882
Operating expenses:
Research and development	17,695	13,128	33,532	25,681
Sales and marketing	17,165	18,976	34,480	35,209
General and administrative	10,424	8,906	20,855	20,691
Total operating expenses	45,284	41,010	88,867	81,581
Income from operations	16,108	10,895	30,159	19,301
Other income (expense), net:
Interest expense	(28)	(39)	70	77
Interest income	2,198	1,452	4,249	2,542
Other income (expense), net	231	(529)	8	(336)
Total other income, net	2,401	884	4,187	2,129
Income before income taxes	18,509	11,779	34,346	21,430
Provision for income taxes	2,277	1,486	4,848	1,995
Net income	$ 16,232	$ 10,293	$ 29,498	$ 19,435
Net income per share:
Basic (USD per share)	$ 0.41	$ 0.26	$ 0.75	$ 0.50
Diluted (USD per share)	$ 0.39	$ 0.24	$ 0.71	$ 0.46
Weighted average shares used in computing net income per share:
Basic (shares)	39,198	38,987	39,143	38,843
Diluted (shares)	41,530	42,215	41,570	42,074