Net Income (Loss) Per Share Attributable to Common shareholders - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 24,325	$ (67,729)	$ (150,045)	$ (244,943)
Deemed dividend from Series D redeemable convertible preferred stock	0	0	(384,436)	0
Adjustments of redeemable convertible preferred stock to redemption value	0	(24,661)	(85,433)	(71,368)
Net income (loss) attributable to common shareholders basic	24,325	(92,390)	(619,914)	(316,311)
Net income (loss) attributable to common shareholders diluted	$ 24,325	$ (92,390)	$ (619,914)	$ (316,311)
Denominator:
Weighted-average shares - basic (in shares)	282,099,073	35,643,589	128,447,673	35,442,927
Effect of dilutive securities:
Weighted-average shares - diluted (in shares)	297,211,838	35,643,589	128,447,673	35,442,927
Net income (loss) per share attributable to common shareholders:
Basic (in dollars per share)	$ 0.09	$ (2.59)	$ (4.83)	$ (8.92)
Diluted (in dollars per share)	$ 0.08	$ (2.59)	$ (4.83)	$ (8.92)
Dilutive awards and units
Effect of dilutive securities:
Dilutive awards and units (in shares)	1,659,504	0	0	0
Dilutive options (in shares)	1,659,504	0	0	0
Dilutive options
Effect of dilutive securities:
Dilutive awards and units (in shares)	13,453,261	0	0	0
Dilutive options (in shares)	13,453,261	0	0	0