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Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2021 (remaining six months) $ 503  
2022 2,933  
2023 3,428  
2024 3,525  
2025 3,625  
2026 and thereafter 13,747  
Total undiscounted lease payments 27,761  
Less: imputed interest 7,226  
Total operating lease liability 20,535  
Less: current portion 712 $ 1,215
Operating lease liability, net of current portion $ 19,823 $ 20,424