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Segment and Geographic Information - Schedule of Revenue by Major Customers (Details) - Customer Concentration Risk - Revenue
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
UnitedHealthcare    
Revenue, Major Customer [Line Items]    
Major customer revenue, percentage 22.00% 22.00%
Aetna    
Revenue, Major Customer [Line Items]    
Major customer revenue, percentage 21.00% 15.00%
Humana    
Revenue, Major Customer [Line Items]    
Major customer revenue, percentage 17.00% 19.00%
Centene    
Revenue, Major Customer [Line Items]    
Major customer revenue, percentage 12.00% 11.00%