Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Revenues	$ 88,830	$ 78,929	$ 175,093	$ 154,272
Cost of revenues	18,891	17,537	37,386	35,246
Gross profit	69,939	61,392	137,707	119,026
Operating expenses:
Research and development	18,058	17,695	36,041	33,532
Sales and marketing	15,783	17,165	34,013	34,480
General and administrative	10,590	10,424	21,714	20,855
Total operating expenses	44,431	45,284	91,768	88,867
Income from operations	25,508	16,108	45,939	30,159
Other income (expense), net:
Interest expense	0	(28)	(3)	(70)
Interest income	1,392	2,198	3,316	4,249
Other income, net	194	231	59	8
Total other income, net	1,586	2,401	3,372	4,187
Income before income taxes	27,094	18,509	49,311	34,346
Provision for income taxes	775	2,277	4,298	4,848
Net income	$ 26,319	$ 16,232	$ 45,013	$ 29,498
Net income per share:
Basic (USD per share)	$ 0.67	$ 0.41	$ 1.15	$ 0.75
Diluted (USD per share)	$ 0.64	$ 0.39	$ 1.10	$ 0.71
Weighted average shares used in computing net income per share:
Basic (shares)	39,161	39,198	39,137	39,143
Diluted (shares)	40,919	41,530	40,928	41,570