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Goodwill and Other Intangible Assets - Summary of Estimated Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
Year ending December 31, 2019 $ 865  
Year ending December 31, 2020 865  
Year ending December 31, 2021 865  
Year ending December 31, 2022 865  
Year ending December 31, 2023 693  
Thereafter 798  
Total $ 4,951 $ 732