CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Series A Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2023	0
Beginning balance at Dec. 31, 2023	$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of redeemable convertible preferred stock, net of derivative liability and issuance costs (in shares)		100,000
Issuance of Series A redeemable convertible preferred stock, net of derivative liability and issuance costs (related party)		$ 500,549
Accretion of redeemable convertible preferred stock (related party)	$ 3,901
Ending balance (in shares) at Mar. 31, 2024	100,000
Ending balance at Mar. 31, 2024	$ 504,450
Beginning balance (in shares) at Dec. 31, 2023			2,299,253,664
Beginning balance at Dec. 31, 2023	4,851,692		$ 230	$ 15,066,080	$ (20,716)	$ 4,850	$ (10,198,752)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(680,859)						(680,859)
Other comprehensive income (loss)	(7,250)					(7,250)
Tax withholding payments for net settlement of employee awards	(3,242)			(3,242)
Issuance of common stock upon vesting of employee RSUs (in shares)			6,259,851
Issuance of common stock upon vesting of employee RSUs	0		$ 1	(1)
Issuance of common stock upon exercise of stock options (in shares)			1,415,298
Issuance of common stock upon exercise of stock options	1,525			1,525
Accretion of redeemable convertible preferred stock (related party)	(3,901)			(3,901)
Stock-based compensation	74,225			74,225
Ending balance (in shares) at Mar. 31, 2024			2,306,928,813
Ending balance at Mar. 31, 2024	$ 4,232,190		$ 231	15,134,686	(20,716)	(2,400)	(10,879,611)
Beginning balance (in shares) at Dec. 31, 2024	175,000	100,000
Beginning balance at Dec. 31, 2024	$ 1,299,842	$ 730,025
Increase (Decrease) in Temporary Equity [Roll Forward]
Accretion of redeemable convertible preferred stock (related party)	$ 364,925
Ending balance (in shares) at Mar. 31, 2025	175,000	100,000
Ending balance at Mar. 31, 2025	$ 1,664,767	$ 955,317
Beginning balance (in shares) at Dec. 31, 2024	3,031,361,899		3,031,361,899
Beginning balance at Dec. 31, 2024	$ 3,872,812		$ 303	16,808,018	(20,716)	(2,099)	(12,912,694)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(366,171)						(366,171)
Other comprehensive income (loss)	7,449					7,449
Tax withholding payments for net settlement of employee awards	(3,277)			(3,277)
Issuance of common stock upon vesting of employee RSUs (in shares)			17,090,704
Issuance of common stock upon vesting of employee RSUs	$ 0		$ 2	(2)
Issuance of common stock upon exercise of stock options (in shares)	348,128		348,128
Issuance of common stock upon exercise of stock options	$ 413			413
Accretion of redeemable convertible preferred stock (related party)	(364,925)			(364,925)
Stock-based compensation	$ 37,374			37,374
Ending balance (in shares) at Mar. 31, 2025	3,048,800,731		3,048,800,731
Ending balance at Mar. 31, 2025	$ 3,183,675		$ 305	$ 16,477,601	$ (20,716)	$ 5,350	$ (13,278,865)