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Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - Major Customer - Customer Concentration Risk
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Revenue    
Concentration Risk [Line Items]    
Concentration risk, percentage 11.00%  
Accounts Receivable    
Concentration Risk [Line Items]    
Concentration risk, percentage 10.00% 10.00%