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Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 103,091 $ 102,780
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization (55,322) (47,160)
Total property and equipment, net 47,769 55,620
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 56,293 56,180
Laboratory equipment    
Property Plant And Equipment [Line Items]    
Useful life (in years) 5 years  
Property and equipment, gross $ 41,216 40,961
Furniture and fixtures    
Property Plant And Equipment [Line Items]    
Useful life (in years) 5 years  
Property and equipment, gross $ 2,890 2,836
Computer equipment    
Property Plant And Equipment [Line Items]    
Useful life (in years) 3 years  
Property and equipment, gross $ 2,692 2,689
Construction in progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 0 $ 114
Minimum | Leasehold improvements    
Property Plant And Equipment [Line Items]    
Useful life (in years) 8 years  
Maximum | Leasehold improvements    
Property Plant And Equipment [Line Items]    
Useful life (in years) 12 years