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Estimated Future Amortization Expense of Purchased Intangible Assets with Definite Lives (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 (remaining three months) $ 641  
2020 2,568  
2021 1,113  
2022 1,113  
2023 1,036  
Thereafter 4,251  
Intangible assets, net $ 10,722 $ 10,980