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Intangible Assets - Estimated Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 319  
2022 319  
2023 319  
2024 195  
2025 107  
Thereafter 166  
Total $ 1,425 $ 6,003