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Balance Sheet Components - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
2020 $ 2,769  
2021 2,762  
2022 2,750  
2023 2,494  
2024 2,324  
Thereafter 3,370  
Net Book Value $ 16,469 $ 5,154