CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Revenue	$ 140,012	$ 83,222	$ 271,260	$ 153,272
Cost of revenue	28,878	20,978	55,357	39,928
Gross profit	111,134	62,244	215,903	113,344
Operating expenses:
Research and development	45,664	24,032	86,488	46,847
Sales and marketing	51,269	36,118	96,484	66,225
General and administrative	13,547	6,088	28,499	13,928
Total operating expenses	110,480	66,238	211,471	127,000
Operating income (loss)	654	(3,994)	4,432	(13,656)
Other income (expense):
Interest expense	(4,294)		(5,001)
Interest income and other income, net	4,466	326	8,069	556
Other income, net	172	326	3,068	556
Income (loss) before provision for income taxes	826	(3,668)	7,500	(13,100)
Provision for income taxes	(542)	(281)	(737)	(340)
Net income (loss)	284	(3,949)	6,763	(13,440)
Net income (loss) attributable to common stockholders	$ 284	$ (3,949)	$ 6,763	$ (13,440)
Basic net income (loss) per share	$ 0.00	$ (0.05)	$ 0.02	$ (0.17)
Diluted net income (loss) per share	$ 0.00	$ (0.05)	$ 0.02	$ (0.17)
Weighted average shares used in calculating basic net income (loss) per share:	299,267	82,044	297,361	79,566
Weighted average shares used in calculating diluted net income (loss) per share:	330,847	82,044	329,402	79,566