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Leases - Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
2021 $ 304  
2022 1,121  
2023 1,044  
2024 1,051  
2025 679  
Thereafter 895  
Total undiscounted lease payments 5,094  
Less: imputed interest (549)  
Operating Lease, Liability $ 4,545 $ 3,925