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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
2021 $ 522  
2022 537  
2023 552  
2024 567  
2025 582  
Thereafter 1,160  
Total operating lease payments 3,920  
Less: imputed interest (113)  
Total operating lease liabilities $ 3,807 $ 888