Balance Sheet Components - Schedule of Accrued and Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Balance Sheet Related Disclosures [Abstract]
Research and development expenses	$ 32,033	$ 29,225
Payroll and related expenses	20,365	31,165
Excess funds payable under grant agreements	2,118	11,589
Operating lease liabilities, current	8,960	7,752
Other professional and consulting expenses	3,235	2,268
Other accrued expenses	1,664	3,874
Total accrued and other liabilities	$ 68,375	$ 85,873