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Intangible Assets - Estimated Amortization Expenses of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2018 $ 908  
2019 897  
2020 797  
2021 353  
2022 353  
Thereafter 3,240  
Total finite–lived assets $ 6,548 $ 7,568