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Summary of Future Estimated Annual Amortization Charges (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 607  
2019 1,154  
2020 314  
2021 314  
2022 314  
2023 314  
2024 290  
Total intangible assets, Net $ 3,307 $ 1,742