CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Revenue (including $45,588 and $4,980 from a related party for the three months ended September 30, 2024 and 2023, and $133,424 and $4,980 for the nine months ended September 30, 2024 and 2023, respectively)	$ 200,038	$ 137,814	$ 573,359	$ 438,120
Costs and expenses
Cost of revenue	412,544	469,722	1,287,695	1,526,051
Research and development	324,371	230,758	896,168	694,035
Selling, general and administrative	233,585	189,691	657,062	556,209
Restructuring charges	76	518	20,304	24,546
Total cost and expenses	970,576	890,689	2,861,229	2,800,841
Loss from operations	(770,538)	(752,875)	(2,287,870)	(2,362,721)
Other income (expense), net
Change in fair value of common stock warrant liability	(13,748)	60,316	20,845	61,647
Change in fair value of equity securities of a related party	(8,836)	0	(38,159)	0
Change in fair value of derivative liabilities associated with redeemable convertible preferred stock (related party)	(240,250)	0	(137,250)	0
Interest income	50,017	66,064	155,201	145,594
Interest expense	(8,478)	(3,340)	(22,652)	(17,138)
Other expense, net	(155)	(763)	(6,229)	(1,024)
Total other income (expense), net	(221,450)	122,277	(28,244)	189,079
Loss before provision for income taxes	(991,988)	(630,598)	(2,316,114)	(2,173,642)
Provision for income taxes	487	296	610	1,012
Net loss	(992,475)	(630,894)	(2,316,724)	(2,174,654)
Accretion of redeemable convertible preferred stock (related party)	42,838	0	(107,924)	0
Net loss attributable to common stockholders, basic	(949,637)	(630,894)	(2,424,648)	(2,174,654)
Net loss attributable to common stockholders, diluted	$ (949,637)	$ (630,894)	$ (2,424,648)	$ (2,174,654)
Weighted-average shares outstanding attributable to common stockholders, basic (in shares)	2,323,971,541	2,284,446,783	2,312,249,333	2,010,916,100
Weighted-average shares outstanding attributable to common stockholders, diluted (in shares)	2,323,971,541	2,284,446,783	2,312,249,333	2,010,916,100
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.41)	$ (0.28)	$ (1.05)	$ (1.08)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.41)	$ (0.28)	$ (1.05)	$ (1.08)
Other comprehensive income (loss)
Net unrealized gains on investments, net of tax	$ 11,891	$ 1,554	$ 7,672	$ 2,590
Foreign currency translation adjustments	5,182	(1,967)	392	(1,381)
Total other comprehensive income (loss)	17,073	(413)	8,064	1,209
Comprehensive loss	(975,402)	(631,307)	(2,308,660)	(2,173,445)
Accretion of redeemable convertible preferred stock (related party)	(42,838)	0	107,924	0
Comprehensive loss attributable to common stockholders	$ (932,564)	$ (631,307)	$ (2,416,584)	$ (2,173,445)