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Goodwill and Intangible Assets - Expected Amortization Expense for Future Period (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2016 $ 30  
2017 98  
2018 98  
2019 98  
2020 98  
2021 71  
Net Carrying Value $ 493 $ 594