Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Revenue	$ 172,205	$ 122,790	$ 331,721	$ 236,728
Cost of revenue	36,735	25,493	70,067	45,852
Gross profit	135,470	97,297	261,654	190,876
Operating expenses
Sales and marketing	103,283	99,905	197,198	153,870
Research and development	63,822	88,627	124,076	123,172
General and administrative	40,667	57,827	83,819	75,754
Total operating expenses	207,772	246,359	405,093	352,796
Loss from operations	(72,302)	(149,062)	(143,439)	(161,920)
Interest income (expense), net	111	(576)	(380)	(1,138)
Other expense, net	(890)	(44)	(347)	(227)
Loss before provision for income taxes	(73,081)	(149,682)	(144,166)	(163,285)
Provision for income taxes	42	37	376	166
Net loss	$ (73,123)	$ (149,719)	$ (144,542)	$ (163,451)
Net loss per share attributable to common stockholders, basic	$ (0.54)	$ (2.04)	$ (1.07)	$ (3.11)
Net loss per share attributable to common stockholders, diluted	$ (0.54)	$ (2.04)	$ (1.07)	$ (3.11)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic	135,927,677	73,539,568	135,232,404	52,564,840
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted	135,927,677	73,539,568	135,232,404	52,564,840
Total comprehensive loss
Net loss	$ (73,123)	$ (149,719)	$ (144,542)	$ (163,451)
Foreign currency translation adjustment	(791)	(200)	(446)	(224)
Comprehensive loss	$ (73,914)	$ (149,919)	$ (144,988)	$ (163,675)