Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025
Numerator
Allocation of losses	$ (96,121)	$ (36,200)	$ (69,005)	$ (11,183)	$ (36,717)	$ (44,773)	$ (201,326)	$ (92,673)
Denominator
Net loss per share, diluted (in dollars per share)							$ (2.04)
Series A Preferred Stock
Numerator
Allocation of losses	$ (13,012)			$ (2,066)			$ (28,285)	$ (17,138)
Denominator
Weighted-average shares outstanding (in shares)	346,045			346,045			346,045	346,045
Net loss per share, basic (in dollars per share)	$ (37.60)			$ (5.97)			$ (81.74)	$ (49.53)
Net loss per share, diluted (in dollars per share)	$ (37.60)			$ (5.97)			$ (81.74)	$ (49.53)
Series B Preferred Stock
Numerator
Allocation of losses	$ 0			$ (100)			$ (868)	$ (825)
Denominator
Weighted-average shares outstanding (in shares)	0			16,667			10,623	16,667
Net loss per share, basic (in dollars per share)	$ 0			$ (5.97)			$ (81.74)	$ (49.53)
Net loss per share, diluted (in dollars per share)	$ 0			$ (5.97)			$ (81.74)	$ (49.53)
Common Stock
Numerator
Allocation of losses	$ (83,109)			$ (9,017)			$ (172,173)	$ (74,710)
Denominator
Weighted-average shares outstanding (in shares)	88,410,821			60,414,223			84,255,008	60,338,541
Net loss per share, basic (in dollars per share)	$ (0.94)			$ (0.15)			$ (2.04)	$ (1.24)
Net loss per share, diluted (in dollars per share)	$ (0.94)			$ (0.15)			$ (2.04)	$ (1.24)