Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Revenue	$ 982,021	$ 739,016	$ 563,948
Costs and operating expenses:
Cost of revenue	349,007	289,799	227,052
Research and development expense	364,191	347,753	367,194
Sales and marketing expense	494,661	364,935	295,227
General and administrative expense	211,410	180,123	155,800
Other operating expense	0	0	83,400
Total costs and operating expenses	1,419,269	1,182,610	1,128,673
Loss from operations	(437,248)	(443,594)	(564,725)
Interest income	34,095	53,691	35,365
Interest expense	(3,897)	(2,581)	(2,578)
Other income (expense), net	(10,490)	(42,605)	53,174
Loss before (benefit from) provision for income taxes	(417,540)	(435,089)	(478,764)
(Benefit from) provision for income taxes	(1,263)	1,284	685
Net loss	$ (416,277)	$ (436,373)	$ (479,449)
Net loss per share, basic (in usd per share)	$ (3.32)	$ (3.56)	$ (4.28)
Net loss per share, diluted (in usd per share)	$ (3.32)	$ (3.56)	$ (4.28)
Weighted-average shares used in computing net loss per share, basic (in shares)	125,374	122,745	111,988
Weighted-average shares used in computing net loss per share, diluted (in shares)	125,374	122,745	111,988