Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 242,963	$ 163,740
Costs and expenses:
Cost of revenue	27,616	26,863
Research and development	437,030	108,767
Sales and marketing	124,095	57,911
General and administrative	243,477	40,801
Total costs and expenses	832,218	234,342
Income (loss) from operations	(589,255)	(70,602)
Other income (expense), net	14,554	10,724
Income (loss) before income taxes	(574,701)	(59,878)
Income tax expense (benefit)	365	988
Net income (loss)	$ (575,066)	$ (60,866)
Net income (loss) per share attributable to Class A and class B common stock, basic (in dollars per share)	$ (8.19)	$ (1.05)
Net income (loss) per share attributable to Class A and class B common stock, diluted (in dollars per share)	$ (8.19)	$ (1.05)
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)	70,240,492	58,114,745
Weighted-average shares of Class A and Class B common stock used to compute net income (loss) per share attributable to common stockholders, diluted (in shares)	70,240,492	58,114,745