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Commitments and Contingencies - Schedule of Aggregate Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]    
2021 $ 170 $ 440
2022 691 66
2023 705 68
2024 462 29
Total future minimum lease payments 2,028 603
Less: imputed interest (364) (74)
Present value of future minimum lease payments 1,664 529
Less: current portion of operating lease liability (486) (395)
Noncurrent portion of lease liabilities $ 1,178 $ 134