Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Numerator
Allocation of losses	$ (155,203)	$ (208,018)	$ (338,790)
Series A Preferred Stock
Numerator
Allocation of losses	$ (27,344)	$ (47,624)	$ (239,158)
Denominator
Weighted-average shares outstanding (in shares)	346,045	374,387	434,612
Weighted average pre-funded warrants outstanding (in shares)		0	0
Number of shares used in per share computation, basic (in shares)	346,045	374,387	434,612
Number of shares used in per share computation, diluted (in shares)	346,045	374,387	434,612
Net loss per share, basic (in dollars per share)	$ (79.02)	$ (127.21)	$ (550.28)
Net loss per share, diluted (in dollars per share)	$ (79.02)	$ (127.21)	$ (550.28)
Series B Preferred Stock
Numerator
Allocation of losses	$ (1,317)	$ (10,839)	$ (4,749)
Denominator
Weighted-average shares outstanding (in shares)	16,667		8,630
Weighted average pre-funded warrants outstanding (in shares)		0	0
Number of shares used in per share computation, basic (in shares)	16,667	85,208	8,630
Number of shares used in per share computation, diluted (in shares)	16,667	85,208	8,630
Net loss per share, basic (in dollars per share)	$ (79.02)	$ (127.21)	$ (550.29)
Net loss per share, diluted (in dollars per share)	$ (79.02)	$ (127.21)	$ (550.29)
Common Stock
Numerator
Allocation of losses	$ (126,541)	$ (149,555)	$ (94,883)
Denominator
Weighted-average shares outstanding (in shares)	64,056,442	46,940,206	6,201,954
Weighted average pre-funded warrants outstanding (in shares)		87,432	695,111
Number of shares used in per share computation, basic (in shares)	64,056,442	47,027,638	6,897,065
Number of shares used in per share computation, diluted (in shares)	64,056,442	47,027,638	6,897,065
Net loss per share, basic (in dollars per share)	$ (1.98)	$ (3.18)	$ (13.76)
Net loss per share, diluted (in dollars per share)	$ (1.98)	$ (3.18)	$ (13.76)