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Leases - Future Minimum Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
2022 $ 253  
2023 985  
2024 744  
2025 528  
2026 515  
Thereafter 4,059  
Total future minimum lease payments 7,084  
Amounts representing interest (930)  
Present value of net future minimum lease payments $ 6,154 $ 4,827