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Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Estimated future amortization expense [Abstract]    
2021 (excluding the nine months ended September 30, 2021) $ 174  
2022 695  
2023 695  
2024 695  
2025 283  
Thereafter 844  
Net Carrying Amount $ 3,386 $ 3,951