Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenue	$ 281,184	$ 183,031	$ 524,147	$ 346,771
Costs and expenses:
Cost of revenue	29,501	28,836	57,117	55,699
Research and development	142,777	109,726	579,807	218,493
Sales and marketing	71,458	59,225	195,553	117,136
General and administrative	68,487	38,233	311,964	79,034
Total costs and expenses	312,223	236,020	1,144,441	470,362
Income (loss) from operations	(31,039)	(52,989)	(620,294)	(123,591)
Other income (expense), net	20,724	13,306	35,278	24,030
Income (loss) before income taxes	(10,315)	(39,683)	(585,016)	(99,561)
Income tax expense (benefit)	(216)	1,426	149	2,414
Net income (loss)	$ (10,099)	$ (41,109)	$ (585,165)	$ (101,975)
Net income (loss) per share attributable to Class A and class B common stock, basic (in dollars per share)	$ (0.06)	$ (0.70)	$ (4.99)	$ (1.75)
Net income (loss) per share attributable to Class A and class B common stock, diluted (in dollars per share)	$ (0.06)	$ (0.70)	$ (4.99)	$ (1.75)
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)	164,382,736	58,508,158	117,311,614	58,312,538
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)	164,382,736	58,508,158	117,311,614	58,312,538