Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 1,300,205	$ 804,029	$ 666,701
Costs and expenses:
Cost of revenue	123,595	111,011	104,799
Research and development	935,152	438,346	365,164
Sales and marketing	350,579	230,175	225,078
General and administrative	451,447	164,658	143,822
Total costs and expenses	1,860,773	944,190	838,863
Income (loss) from operations	(560,568)	(140,161)	(172,162)
Other income (expense), net	75,361	53,138	14,234
Income (loss) before income taxes	(485,207)	(87,023)	(157,928)
Income tax expense (benefit)	(931)	3,801	622
Net income (loss)	$ (484,276)	$ (90,824)	$ (158,550)
Net income (loss) per share attributable to Class A and Class B common stock, basic (in dollars per share)	$ (3.33)	$ (1.54)	$ (2.77)
Net income (loss) per share attributable to Class A and Class B common stock, diluted (in dollars per share)	$ (3.33)	$ (1.54)	$ (2.77)
Weighted-average shares of Class A and Class B common stock used to compute net income (loss) per share attributable to common stockholders, basic (in shares)	145,472,389	59,138,086	57,251,112
Weighted-average shares of Class A and Class B common stock used to compute net income (loss) per share attributable to common stockholders, basic (in shares)	145,472,389	59,138,086	57,251,112