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, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator
Allocation of losses	$ (11,183)	$ (36,717)	$ (44,773)	$ (69,028)	$ (38,837)	$ (43,857)	$ (92,673)	$ (151,722)
Denominator
Net loss per share, diluted (in dollars per share)							$ (1.24)
Series A Preferred Stock
Numerator
Allocation of losses	$ (2,066)			$ (14,610)			$ (17,138)	$ (36,733)
Denominator
Weighted-average shares outstanding (in shares)	346,045			346,045			346,045	383,903
Weighted-average pre-funded warrants (in shares)							0	0
Number of shares used in per share computation, basic (in shares)	346,045			346,045			346,045	383,903
Number of shares used in per share computation, diluted (in shares)	346,045			346,045			346,045	383,903
Net loss per share, basic (in dollars per share)	$ (5.97)			$ (42.22)			$ (49.53)	$ (95.68)
Net loss per share, diluted (in dollars per share)	$ (5.97)			$ (42.22)			$ (49.53)	$ (95.68)
Series B Preferred Stock
Numerator
Allocation of losses	$ (100)			$ (704)			$ (825)	$ (9,105)
Denominator
Weighted-average shares outstanding (in shares)	16,667			16,667			16,667	95,158
Weighted-average pre-funded warrants (in shares)							0	0
Number of shares used in per share computation, basic (in shares)	16,667			16,667			16,667	95,158
Number of shares used in per share computation, diluted (in shares)	16,667			16,667			16,667	95,158
Net loss per share, basic (in dollars per share)	$ (5.97)			$ (42.24)			$ (49.53)	$ (95.68)
Net loss per share, diluted (in dollars per share)	$ (5.97)			$ (42.24)			$ (49.53)	$ (95.68)
Common Stock
Numerator
Allocation of losses	$ (9,017)			$ (53,714)			$ (74,710)	$ (105,884)
Denominator
Weighted-average shares outstanding (in shares)	60,414,223			50,889,443			60,338,541	44,146,958
Weighted-average pre-funded warrants (in shares)							0	116,788
Number of shares used in per share computation, basic (in shares)	60,414,223			50,889,443			60,338,541	44,263,746
Number of shares used in per share computation, diluted (in shares)	60,414,223			50,889,443			60,338,541	44,263,746
Net loss per share, basic (in dollars per share)	$ (0.15)			$ (1.06)			$ (1.24)	$ (2.39)
Net loss per share, diluted (in dollars per share)	$ (0.15)			$ (1.06)			$ (1.24)	$ (2.39)