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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Estimated future intangible asset amortization expense    
2019 (excluding the nine months ended June 30, 2019) $ 1,456  
2020 3,607  
2021 2,391  
2022 2,248  
2023 217  
Total $ 9,919 $ 14,536