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Summary of Significant Accounting Policies - Customer Concentration (Details) - Customer Concentration Risk
3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Revenue Benchmark | Customer 1    
Product Information [Line Items]    
Concentration risk, percentage 16.00%  
Revenue Benchmark | Customer 2    
Product Information [Line Items]    
Concentration risk, percentage 13.00%  
Revenue Benchmark | Customer 3    
Product Information [Line Items]    
Concentration risk, percentage 13.00%  
Accounts Receivable | Customer 1    
Product Information [Line Items]    
Concentration risk, percentage   22.00%
Accounts Receivable | Customer 2    
Product Information [Line Items]    
Concentration risk, percentage   13.00%