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Detail of Certain Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Expected merchandise returns, net $ 19,191 $ 9,585
Advanced payments on inventory to be delivered from vendors 12,218 5,224
Prepaid insurance 2,618 1,425
Prepaid rent 419 476
Prepaid packaging 368 375
Other 4,501 3,245
Total prepaid expenses and other current assets $ 39,315 $ 20,330