Fair Value Measurement - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets
Money market funds included in cash and cash equivalents	$ 262,997	$ 36,882
Total	262,997	36,882
Liabilities
Common stock warrant liability	55,421	20,835
Total	55,421	20,835
Level 1
Assets
Money market funds included in cash and cash equivalents	262,997	36,882
Total	262,997	36,882
Liabilities
Common stock warrant liability	0	0
Total	0	0
Level 2
Assets
Money market funds included in cash and cash equivalents	0	0
Total	0	0
Liabilities
Common stock warrant liability	0	0
Total	0	0
Level 3
Assets
Money market funds included in cash and cash equivalents	0	0
Total	0	0
Liabilities
Common stock warrant liability	55,421	20,835
Total	$ 55,421	$ 20,835