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Basis of Presentation and Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 17, 2021
USD ($)
Mar. 15, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
numberOfReportableSegment
numberOfOperatingSegment
Jun. 30, 2020
USD ($)
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Inventory and fixed asset losses due to fulfillment center fire       $ 284,825 $ 0
Number of operating segments | numberOfOperatingSegment       1  
Number of reportable segments | numberOfReportableSegment       1  
Fire          
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Increase in net loss due to fulfillment center fire     $ 296,000 $ 296,000  
Fire | Cost of sales          
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Inventory and fixed asset losses due to fulfillment center fire $ 158,000        
Fire | Operating, general and administrative          
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Inventory and fixed asset losses due to fulfillment center fire 127,000        
Liability for catastrophe claims $ 11,000        
Options          
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Vesting period       4 years  
Cash and Cash Equivalents | Financial Institutions | Three Financial Institutions          
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Concentration risk percentage       69.00%  
Accounts Receivable | Customer Concentration Risk | Four Payment Processing Companies          
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Concentration risk percentage       55.00%  
Common Class A          
Basis of Presentation of Summary of Significant Accounting Policies [Line Items]          
Sale of stock, number of shares issued in transaction (in shares) | shares   100,000,000      
Sale of stock, price per share (in usd per share) | $ / shares   $ 35.00      
Proceeds from sale of stock, net   $ 3,400,000      
Payments for underwriting discounts   $ 69,000