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Estimated Future Amortization Expense of Purchased Intangible Assets with Definite Lives (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 (remaining six months) $ 1,285  
2020 2,569  
2021 1,114  
2022 1,114  
2023 1,038  
Thereafter 4,258  
Intangible assets, net $ 11,378 $ 10,980