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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Estimated future intangible asset amortization expense    
2020 (excluding the quarter ended December 31, 2019) $ 3,214  
2020 3,664  
2021 3,372  
2022 1,317  
2023 917  
Total $ 12,484 $ 14,139