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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Estimated future intangible asset amortization expense    
2021 (excluding the nine months ended June 30, 2021) $ 563  
2022 2,105  
2023 1,100  
2024 917  
Total $ 4,685 $ 9,236