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Significant Retailer and Partner Concentration (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Partner Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration risk 13.00%    
Walmart | Customer Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration risk 27.00% 34.00% 36.00%
Walmart | Customer Concentration Risk | Accounts Receivable      
Concentration Risk [Line Items]      
Concentration risk   13.00%