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Goodwill and Intangible Assets - Amortization Expense on Existing Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
Remainder of 2017 $ 152  
2018 279  
2019 252  
2020 186  
Total $ 869 $ 969