Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenue	$ 499,627	$ 281,184	$ 891,988	$ 524,147
Costs and expenses:
Cost of revenue	45,900	29,501	82,989	57,117
Research and development	196,610	142,777	387,881	579,807
Sales and marketing	120,619	71,458	211,304	195,553
General and administrative	68,787	68,487	138,200	311,964
Total costs and expenses	431,916	312,223	820,374	1,144,441
Income (loss) from operations	67,711	(31,039)	71,614	(620,294)
Other income (expense), net	21,147	20,724	41,681	35,278
Income (loss) before income taxes	88,858	(10,315)	113,295	(585,016)
Income tax expense (benefit)	(439)	(216)	(2,160)	149
Net income (loss)	$ 89,297	$ (10,099)	$ 115,455	$ (585,165)
Net income (loss) per share attributable to Class A and Class B common stock (Note 4)
Basic (in dollars per share)	$ 0.48	$ (0.06)	$ 0.63	$ (4.99)
Diluted (in dollars per share)	$ 0.45	$ (0.06)	$ 0.58	$ (4.99)
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)	185,437,777	164,382,736	183,730,992	117,311,614
Diluted (in shares)	199,522,433	164,382,736	200,681,458	117,311,614