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Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2021—remaining $ 3,104  
2022 5,965  
2023 3,915  
2024 1,860  
2025 1,200  
Net $ 16,044 $ 19,289