Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Contributions to Revenue and Receivables by Payor (Details)

v3.21.2
Basis of Presentation and Summary of Significant Accounting Policies - Contributions to Revenue and Receivables by Payor (Details) - Customer Concentration Risk
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Net Revenue | Payor A          
Accounts Receivable And Net Revenue [Line Items]          
Concentration risk 13.80% 12.70% 13.10% 12.10%  
Net Revenue | Payor B          
Accounts Receivable And Net Revenue [Line Items]          
Concentration risk     10.10% 10.10%  
Net Revenue | Payor C          
Accounts Receivable And Net Revenue [Line Items]          
Concentration risk 13.30% 16.20% 15.40% 17.00%  
Net Revenue | Payor D          
Accounts Receivable And Net Revenue [Line Items]          
Concentration risk 17.10% 16.70% 12.10% 14.20%  
Receivables and Receivables-Related Parties | Payor C          
Accounts Receivable And Net Revenue [Line Items]          
Concentration risk     13.70%    
Receivables and Receivables-Related Parties | Payor F          
Accounts Receivable And Net Revenue [Line Items]          
Concentration risk     42.00%   43.90%
Receivables and Receivables-Related Parties | Payor G          
Accounts Receivable And Net Revenue [Line Items]          
Concentration risk     25.80%   36.50%