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Estimated Future Amortization Expense of Purchased Intangible Assets with Definite Lives (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 (remaining three months) $ 363  
2018 1,455  
2019 1,455  
2020 1,455  
Intangible Assets, net $ 4,728 $ 5,820