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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Leases    
2021 (Remainder) $ 183  
2022 703  
2023 671  
2024 343  
2025 69  
Thereafter  
Total lease payments 1,969  
Less: Imputed interest (163)  
Total $ 1,806 $ 2,068