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Geographic Information - Narrative (Details) - segment
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting [Abstract]        
Number of operating segments     1  
United States | Revenue | Geographic concentration risk        
Concentration Risk [Line Items]        
Concentration risk, percentage 60.00% 63.00% 61.00% 64.00%