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Goodwill and Intangible Assets - Summary of Estimated Remaining Amortization Expense for Finite-Lived Intangible Assets (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]  
2018 $ 333
2019 1,082
2020 834
2021 834
2022 620
2023 and thereafter 2,568
Total $ 6,271