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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid expenses $ 13,464 $ 10,913
Deposits 3,638 2,773
Other 5,924 3,308
Total prepaid expenses and other current assets $ 23,026 $ 16,994