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Balance Sheet Components - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
Reserve for member refunds $ 4,085 $ 288
Accrued advertising expense 469 1,654
Accrued compensation expense 2,144 2,477
Other accrued expenses 1,951 1,862
Total accrued expenses and other $ 8,649 $ 6,281