Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Percentage of Patient Accounts Receivable by Payor (Details)

v3.20.4
Summary of Significant Accounting Policies - Percentage of Patient Accounts Receivable by Payor (Details) - Product Concentration Risk - Accounts Receivable
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]    
Concentration risk percentage 100.00% 100.00%
Medicare    
Concentration Risk [Line Items]    
Concentration risk percentage 55.30% 48.30%
Medicaid    
Concentration Risk [Line Items]    
Concentration risk percentage 9.20% 9.40%
Managed Care, Commercial, and Other    
Concentration Risk [Line Items]    
Concentration risk percentage 35.50% 42.30%