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Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 473  
2018 1,207  
2019 691  
2020 654  
2021 599  
Thereafter 1,477  
Net Value $ 5,101 $ 7,267