CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Issuance of convertible Series C preferred stock, net of issuance costs	Issuance of convertible Series C-1 preferred stock, net of issuance costs	Convertible Preferred Stock (Series A, B, C, and C-1)	Convertible Preferred Stock (Series A, B, C, and C-1) Issuance of convertible Series C preferred stock, net of issuance costs	Convertible Preferred Stock (Series A, B, C, and C-1) Issuance of convertible Series C-1 preferred stock, net of issuance costs	Common Stock Including Class A, Class B, and Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2024				99,565,570			45,542,122
Beginning balance at Dec. 31, 2024	$ 435,943			$ 1,411,313			$ (5,887)	$ 0	$ (969,276)	$ (207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)					8,384,459	23,545,451	537,933
Issuance of stock	2,095	$ 206,241	$ 724,278		$ 206,241	$ 724,278		2,095
Convertible preferred stock paid-in-kind dividend	(39,136)			$ 39,136				(19,222)	(19,914)
Stock-based compensation	16,819							16,819
Warrant expense	308							308
Foreign currency translation adjustments	114									114
Net loss	(595,909)								(595,909)
Ending balance (in shares) at Sep. 30, 2025				131,495,480			46,080,055
Ending balance at Sep. 30, 2025	789,889			$ 2,380,968			$ (5,887)	0	(1,585,099)	(93)
Beginning balance (in shares) at Jun. 30, 2025				99,735,577			45,895,052
Beginning balance at Jun. 30, 2025	293,212			$ 1,438,733			$ (5,887)	0	(1,139,651)	17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)					8,214,452	23,545,451	185,003
Issuance of stock	849	$ 203,361	$ 724,278		$ 203,361	$ 724,278		849
Convertible preferred stock paid-in-kind dividend	(14,596)			$ 14,596				(6,362)	(8,234)
Stock-based compensation	5,205							5,205
Warrant expense	308							308
Foreign currency translation adjustments	(110)									(110)
Net loss	(437,214)								(437,214)
Ending balance (in shares) at Sep. 30, 2025				131,495,480			46,080,055
Ending balance at Sep. 30, 2025	789,889			$ 2,380,968			$ (5,887)	0	(1,585,099)	(93)
Beginning balance (in shares) at Dec. 31, 2025				0			229,228,031
Beginning balance at Dec. 31, 2025	1,817,836			$ 0			$ 23	3,731,273	(1,913,450)	(10)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)							4,006,468
Issuance of stock	13,047						$ 2	13,045
Issuance of common stock upon vesting of restricted stock (in shares)							872,929
Convertible preferred stock paid-in-kind dividend	0
Stock-based compensation	49,352							49,352
Warrant expense	17,091							17,091
Issuance of Class A common stock in connection with asset acquisition (in shares)							715,587
Issuance of common stock in connection with asset acquisition	10,797							10,797
Foreign currency translation adjustments	(206)									(206)
Net loss	(390,181)								(390,181)
Ending balance (in shares) at Sep. 30, 2026				0			234,823,015
Ending balance at Sep. 30, 2026	1,517,736			$ 0			$ 25	3,821,558	(2,303,631)	(216)
Beginning balance (in shares) at Jun. 30, 2026				0			233,845,906
Beginning balance at Jun. 30, 2026	1,615,177			$ 0			$ 24	3,799,864	(2,184,512)	(199)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)							976,949
Issuance of stock	4,673						$ 1	4,672
Issuance of common stock upon vesting of restricted stock (in shares)							160
Convertible preferred stock paid-in-kind dividend	0
Stock-based compensation	11,262							11,262
Warrant expense	5,760							5,760
Foreign currency translation adjustments	(17)									(17)
Net loss	(119,119)								(119,119)
Ending balance (in shares) at Sep. 30, 2026				0			234,823,015
Ending balance at Sep. 30, 2026	$ 1,517,736			$ 0			$ 25	$ 3,821,558	$ (2,303,631)	$ (216)