Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Revenue	$ 950,010	$ 720,203	$ 514,821
Cost of revenue	174,462	148,416	98,312
Gross profit	775,548	571,787	416,509
Operating expenses
Sales and marketing	494,908	424,976	308,511
Research and development	300,571	270,982	237,290
General and administrative	195,746	166,283	156,635
Total operating expenses	991,225	862,241	702,436
Loss from operations	(215,677)	(290,454)	(285,927)
Interest income	19,779	5,826	175
Interest expense	(1,957)	(2,135)	(2,328)
Accretion income, net	9,794	2,035	0
Other expense, net	(360)	(1,737)	(843)
Loss before provision for (benefit from) income taxes	(188,421)	(286,465)	(288,923)
Provision for (benefit from) income taxes	1,273	466	(23,758)
Net loss	$ (189,694)	$ (286,931)	$ (265,165)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (1.34)	$ (2.10)	$ (2.86)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (1.34)	$ (2.10)	$ (2.86)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	141,961,467	136,525,728	92,673,453
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	141,961,467	136,525,728	92,673,453
Other comprehensive income (loss)
Foreign currency translation adjustment, net of tax	$ 437	$ (1,355)	$ (770)
Unrealized income (loss) on available-for-sale debt and marketable securities, net of tax	504	(378)	0
Total other comprehensive income (loss)	941	(1,733)	(770)
Comprehensive loss	$ (188,753)	$ (288,664)	$ (265,935)