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Balance Sheet Components - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
2021 $ 4,104  
2022 16,283  
2023 16,283  
2024 12,281  
2025 7,550  
Thereafter 26,740  
Net Carrying Amount $ 83,241 $ 0