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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Estimated future intangible asset amortization expense    
2020 (excluding the nine months ended June 30, 2020) $ 938  
2021 3,617  
2022 3,330  
2023 1,317  
2024 917  
Total $ 10,119 $ 14,139