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Balance Sheet Components - Goodwill (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Goodwill $ 17,167,000   $ 17,167,000
Goodwill, impairment loss $ 0 $ 0