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Goodwill and Intangible Assets - Expected Amortization Expense for Future Period (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 74  
2019 98  
2020 98  
2021 71  
Net Carrying Value $ 341 $ 365