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Estimated Future Amortization Expense of Purchased Intangible Assets with Definite Lives (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 (remaining nine months) $ 1,091  
2018 1,455  
2019 1,455  
2020 1,455  
Intangible Assets, net $ 5,456 $ 5,820