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Intangible Assets - Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite Lived Intangible Assets Net [Abstract]    
2017 - 3 months remaining $ 64  
2018 249  
2019 143  
2020 47  
2021 40  
Beyond 8  
Net book value $ 551 $ 745