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Goodwill and Intangibles - Summary of Future Estimated Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2018 $ 67
2019 67
2020 67
2021 36
2022 and thereafter 0
Total $ 237