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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 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Revenue | Medicare      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk 30.00% 27.00%  
Revenue | UnitedHealthcare      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk 9.00% 11.00%  
Revenue | Customers Representing >10% Of Total Revenue      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk 39.00% 38.00%  
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%