Annual report pursuant to Section 13 and 15(d)

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

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Summary of Significant Accounting Policies - Percentage of Patient Accounts Receivable by Payor (Details) - Product Concentration Risk - Accounts Receivable
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]    
Concentration risk percentage 100.00% 100.00%
Medicare    
Concentration Risk [Line Items]    
Concentration risk percentage 48.30% 51.30%
Medicaid    
Concentration Risk [Line Items]    
Concentration risk percentage 9.40% 8.60%
Managed Care, Commercial, and Other    
Concentration Risk [Line Items]    
Concentration risk percentage 42.30% 40.10%