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Goodwill and Intangible Assets - Expected Amortization Expense for Future Period (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 49  
2019 98  
2020 98  
2021 71  
Net Book Value $ 316 $ 365