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Commitments and Contingencies - Maturity of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]    
2021—remaining $ 1,089  
2022 1,824  
2023 1,722  
2024 1,388  
2025 302  
2026 296  
Thereafter 377  
Total lease payments 6,998  
Less: amount representing interest (607)  
Present value of future lease payments $ 6,391 $ 7,100