Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Revenue	$ 392,361	$ 242,963
Costs and expenses:
Cost of revenue	37,089	27,616
Research and development	191,271	437,030
Sales and marketing	90,685	124,095
General and administrative	69,413	243,477
Total costs and expenses	388,458	832,218
Income (loss) from operations	3,903	(589,255)
Other income (expense), net	20,534	14,554
Income (loss) before income taxes	24,437	(574,701)
Income tax expense (benefit)	(1,721)	365
Net income (loss)	$ 26,158	$ (575,066)
Net income (loss) per share attributable to Class A and Class B common stock (Note 4)
Basic (in dollars per share)	$ 0.14	$ (8.19)
Diluted (in dollars per share)	$ 0.13	$ (8.19)
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)	182,024,207	70,240,492
Diluted (in shares)	201,275,223	70,240,492