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Estimated Future Amortization Expense of Purchased Intangible Assets with Definite Lives (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
2021 $ 1,120  
2022 1,120  
2023 1,043  
2024 967  
2025 967  
Thereafter 2,346  
Intangible assets, net $ 7,563 $ 10,104