Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 93,069	$ 82,671	$ 268,162	$ 236,943
Cost of revenues	20,619	17,108	58,005	52,354
Gross profit	72,450	65,563	210,157	184,589
Operating expenses:
Research and development	17,864	16,899	53,905	50,431
Sales and marketing	16,060	17,009	50,073	51,489
General and administrative	12,223	9,106	33,937	29,961
Total operating expenses	46,147	43,014	137,915	131,881
Income from operations	26,303	22,549	72,242	52,708
Other income (expense), net:
Interest expense	(1)	(28)	(4)	(98)
Interest income	1,123	2,142	4,439	6,391
Other income (expense), net	209	(328)	268	(320)
Total other income, net	1,331	1,786	4,703	5,973
Income before income taxes	27,634	24,335	76,945	58,681
Provision for income taxes	4,891	5,161	9,189	10,009
Net income	$ 22,743	$ 19,174	$ 67,756	$ 48,672
Net income per share:
Basic (in dollars per share)	$ 0.58	$ 0.49	$ 1.73	$ 1.24
Diluted (in dollars per share)	$ 0.56	$ 0.47	$ 1.66	$ 1.17
Weighted average shares used in computing net income per share:
Basic (in shares)	39,238	39,014	39,171	39,099
Diluted (in shares)	40,764	41,162	40,907	41,447