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Goodwill and Acquired Intangible Assets - Schedule of Expected Amortization Expense in Future Periods (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 1,666  
2018 1,666  
2019 1,666  
2020 1,666  
Thereafter 1,729  
Net Book Value $ 8,393 $ 7,991