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Intangible Assets - Schedule of Future Amortization Expense for Remaining Unamortized Balance (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]    
2022 $ 100  
2023 100  
2024 98  
2025 97  
2026 97  
Thereafter 366  
Net Carrying Amount $ 858 $ 609