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Estimated Future Amortization Expense of Purchased Intangible Assets with Definite Lives (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 (remaining three months) $ 532  
2019 2,125  
2020 2,125  
2021 670  
2022 670  
Thereafter 3,033  
Intangible assets, net $ 9,155 $ 4,365