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Leases - Aggregate Payments of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Aggregate payments of operating lease liabilities:    
2021 $ 256  
2022 201  
2023 158  
2024 88  
2025 37  
Thereafter 281  
Total 1,021  
Less imputed interest (213)  
Total operating lease liabilities $ 808 $ 691