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Certain Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid expenses $ 12,210 $ 6,162
Card program deposits 2,167 2,174
Other current assets 5,482 3,125
Prepaid expenses and other current assets $ 19,859 $ 11,461