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Other Financial Statement Details - Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Net Amount $ 14,581 $ 16,525
Patents And Trademark [Member]    
Finite Lived Intangible Assets [Line Items]    
2021 1,944  
2022 1,944  
2023 1,944  
2024 1,944  
2025 1,944  
2026 and thereafter 4,861  
Net Amount $ 14,581