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Significant Risks and Uncertainties Including Business and Credit Concentrations
3 Months Ended
Mar. 31, 2023
Risks and Uncertainties [Abstract]  
Significant Risks and Uncertainties Including Business and Credit Concentrations Significant Risks and Uncertainties Including Business and Credit Concentrations
Credit Risk
Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, accounts receivable, and investment securities.
Cash accounts in a financial institution may, at times, exceed the Federal Deposit Insurance Corporation coverage of $250 per account ownership category. The Company has not experienced losses on these accounts, and management believes the Company is not exposed to significant risks on such accounts.
The Company’s accounts receivable has implicit collection risk. The Company grants credit without collateral to their patients, most of whom are local residents and are insured under third-party payor agreements. The Company believes this risk is partially mitigated by the Company’s establishment of long-term agreements and relationships with third-party payors that provide the Company with insight into historic collectability and improve the collections process.
The Company's investment securities portfolio is managed by a third party vendor to provide a relatively stable source of investment income from excess liquidity while satisfactorily managing risk, including credit risk, reinvestment risk, liquidity risk, and interest rate risk.
Revenue Concentration Risk
The concentration of net revenue on a percentage basis for major payors for the three months ended March 31, 2023 and 2022 are as follows:

Three Months Ended March 31,
20232022
Percentage of Net Revenue: 
Payor A11 %16 %
Payor B15 %17 %
The concentration of gross receivables on a percentage basis for major payors at March 31, 2023 and December 31, 2022 are as follows:
March 31, 2023December 31, 2022
Percentage of Gross Receivables: 
Payor B13 %13 %
Payor C10 %10 %
All of the Company’s revenue is generated from customers located in the United States.
Vendor Concentration Risk
The concentration of cost of sales on a percentage basis for major vendors for the three months ended March 31, 2023 and 2022 are as follows:
Three Months Ended March 31,
20232022
Percentage of Cost of Sales: 
Vendor A99 %51 %
Vendor BN/A47 %
The concentration of gross payables on a percentage basis for major payors at March 31, 2023 and December 31, 2022 are as follows:
March 31, 2023December 31, 2022
Percentage of Gross Payables:
Vendor A71 %66 %
Vendor C11 %N/A