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Organization, Description of Business and Summary of Significant Accounting Policies - Schedule of Third-party Payers And Other Customers (Details) - Customer concentration risk
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Revenue | Medicare          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk 31.00% 31.00% 31.00% 31.00%  
Revenue | UnitedHealthcare          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk 10.00% 9.00% 10.00% 10.00%  
Revenue | Customers Representing >10% Of Total Revenue          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk 41.00% 40.00% 41.00% 41.00%  
Accounts receivable | Medicare          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk     14.00%   12.00%
Accounts receivable | UnitedHealthcare          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk     10.00%   9.00%