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Balance Sheet Components (Schedule Of Amortization Of Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Balance Sheet Components [Abstract]    
2021 $ 665  
2022 665  
2023 665  
2024 665  
2025 665  
Thereafter 557  
Intangible assets, net $ 3,882 $ 4,547