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Summary of Future Estimated Annual Amortization Charges (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 901  
2019 841  
Total intangible assets, Net $ 1,742 $ 2,978