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Balance Sheet Components - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Credit card processing reserve $ 5,854 $ 2,650
Prepaid expenses 3,772 2,460
Other current assets 865 4,354
Prepaid expenses and other current assets 10,491 $ 9,464
Impairment charges 3,573  
Prepaid expenses and other current assets    
Impairment charges $ 3,400