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Significant Risks and Uncertainties Including Business and Credit Concentrations (Tables)
 3 Months Ended
Mar. 31, 2022
Risks and Uncertainties [Abstract]  
Summary of concentration risk
The concentration of net revenue on a percentage basis for major payors for the three months ended March 31, 2022 and 2021 are as follows:

Three Months Ended March 31,
20222021
Percentage of Net Revenue: 
Payor A16 %17 %
Payor B17 %13 %
The concentration of gross receivables on a percentage basis for major payors at March 31, 2022 and December 31, 2021 are as follows:
March 31, 2022December 31, 2021
Percentage of Gross Receivables: 
Payor B21 %19 %
Payor C13 %14 %
The concentration of cost of sales on a percentage basis for major vendors for the three months ended March 31, 2022 and 2021 are as follows:
Three Months Ended March 31,
20222021
Percentage of Cost of Sales: 
Vendor A51 %48 %
Vendor B47 %50 %
The concentration of gross payables on a percentage basis for major payors at March 31, 2022 and December 31, 2021 are as follows:
March 31, 2022December 31, 2021
Percentage of Gross Payables:
Vendor B55 %47 %
Vendor A28 %39 %
All others17 %14 %