Balance Sheet Components - Summary of Accrued Expense and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accrued Liabilities, Current [Abstract]
Accrued research and development materials and services	$ 4,945	$ 5,947
Accrued personnel expenses	2,938	452
Accrued professional services	354	60
Other	144	203
Total accrued expenses and other current liabilities	$ 8,381	$ 6,662