CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - 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 (including $30,247 and $36,470 from a related party for the three months ended June 30, 2025 and 2024, and $35,343 and $87,836 for the six months ended June 30, 2025 and 2024, respectively)	$ 259,432	$ 200,581	$ 494,480	$ 373,321
Costs and expenses
Cost of revenue	531,783	470,355	995,343	875,151
Research and development	273,839	287,170	525,085	571,797
Selling, general and administrative	256,857	210,245	469,032	423,477
Restructuring charges	0	20,228	0	20,228
Total cost and expenses	1,062,479	987,998	1,989,460	1,890,653
Loss from operations	(803,047)	(787,417)	(1,494,980)	(1,517,332)
Other income (expense), net
Change in fair value of common stock warrant liability	5,322	7,539	18,183	34,593
Change in fair value of equity securities of a related party	3,948	(9,390)	(9,505)	(29,323)
Change in fair value of derivative liabilities associated with redeemable convertible preferred stock (related party)	111,475	103,000	393,175	103,000
Gain on extinguishment of debt	116,360	0	116,360	0
Interest income	44,318	54,553	96,527	105,184
Interest expense (including $4,912 and $1,322 to a related party for the three months ended June 30, 2025 and 2024, and $8,612 and $2,703 for the six months ended June 30, 2025 and 2024, respectively)	(23,749)	(6,673)	(35,632)	(14,174)
Other income (expense), net	3,572	(5,067)	6,537	(6,074)
Total other income, net	261,246	143,962	585,645	193,206
Loss before provision for (benefit from) income taxes	(541,801)	(643,455)	(909,335)	(1,324,126)
Provision for (benefit from) income taxes	(2,369)	(65)	(3,732)	123
Net loss	(539,432)	(643,390)	(905,603)	(1,324,249)
Accretion of redeemable convertible preferred stock (related party)	(199,823)	(146,861)	(564,748)	(150,762)
Net loss attributable to common stockholders, basic	(739,255)	(790,251)	(1,470,351)	(1,475,011)
Interest expense on 2026 Notes	309	0	4,283	0
Gain on extinguishment of debt	(116,360)	0	(116,360)	0
Net loss attributable to common stockholders, diluted	$ (855,306)	$ (790,251)	$ (1,582,428)	$ (1,475,011)
Weighted-average shares outstanding attributable to common stockholders
Basic (in shares)	3,056,404,834	2,310,360,525	3,046,411,837	2,306,209,050
Diluted (in shares)	3,057,882,724	2,310,360,525	3,056,708,079	2,306,209,050
Net loss per share attributable to common stockholders
Basic (in dollars per share)	$ (0.24)	$ (0.34)	$ (0.48)	$ (0.64)
Diluted (in dollars per share)	$ (0.28)	$ (0.34)	$ (0.52)	$ (0.64)
Other comprehensive income (loss)
Net unrealized gains (losses) on investments, net of tax	$ 293	$ (957)	$ 3,845	$ (4,219)
Foreign currency translation adjustments	8,973	(802)	12,870	(4,790)
Total other comprehensive income (loss)	9,266	(1,759)	16,715	(9,009)
Comprehensive loss	(530,166)	(645,149)	(888,888)	(1,333,258)
Accretion of redeemable convertible preferred stock (related party)	(199,823)	(146,861)	(564,748)	(150,762)
Comprehensive loss attributable to common stockholders	$ (729,989)	$ (792,010)	$ (1,453,636)	$ (1,484,020)