Net Loss Per Share - Calculation of Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Numerator:
Net loss	$ (148,753)	$ (80,416)	$ (271,062)	$ (158,694)
Convertible preferred stock PIK dividend	0	12,376	0	24,540
Net loss attributable to common stockholders, basic	(148,753)	(92,792)	(271,062)	(183,234)
Net loss attributable to common stockholders, diluted	$ (148,753)	$ (92,792)	$ (271,062)	$ (183,234)
Denominator:
Weighted-average common shares outstanding, basic (in shares)	231,977,950	45,834,973	230,815,748	45,734,278
Weighted-average common shares outstanding, diluted (in shares)	231,977,950	45,834,973	230,815,748	45,734,278
Net loss per share, basic (in dollars per share)	$ (0.64)	$ (2.02)	$ (1.17)	$ (4.01)
Net loss per share, diluted (in dollars per share)	$ (0.64)	$ (2.02)	$ (1.17)	$ (4.01)