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Significant Service Providers (Details) - Service Provider Concentration Risk - Revenue
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Ten Largest Service Providers        
Concentration Risk [Line Items]        
Concentration risk percentage 50.00% 52.00% 49.00% 52.00%
Minimum | Service Provider A        
Concentration Risk [Line Items]        
Concentration risk percentage 15.00% 15.00% 15.00% 15.00%
Maximum | Service Provider A        
Concentration Risk [Line Items]        
Concentration risk percentage 20.00% 20.00% 20.00% 20.00%