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Summary of Significant Accounting Policies - Concentrations of Credit and Other Risks (Details) - Customer Concentration Risk - Major Customers
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue          
Concentration Risk [Line Items]          
Concentration risk percentage 13.00% 14.00% 15.00% 14.00%  
Accounts Receivable          
Concentration Risk [Line Items]          
Concentration risk percentage     10.00%   10.00%