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Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (remaining nine months) $ 1,796  
2019 2,358  
2020 1,713  
2021 1,428  
2022 1,006  
Thereafter 42  
Net $ 8,343 $ 2,297