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Leases - Schedule of Undiscounted Future Minimum Lease Commitments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Operating Lease Liabilities Payments Due [Abstract]    
2021 (remainder of year from October 1, 2021 to December 31, 2021) $ 150  
2022 612  
2023 563  
2024 532  
2025 396  
Thereafter 1,064  
Total undiscounted future minimum lease payments 3,317  
Less imputed interest (451)  
Present value of lease liabilities $ 2,866 $ 1,003