Basis of Presentation and Summary of Significant Accounting Policies - Contributions to Revenue and Receivables by Payor (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Net Revenue | Payor A
Accounts Receivable And Net Revenue [Line Items]
Concentration risk	11.90%	13.70%	11.90%	15.80%
Net Revenue | Payor B
Accounts Receivable And Net Revenue [Line Items]
Concentration risk	10.30%	12.60%	10.30%	14.30%
Net Revenue | Payor C
Accounts Receivable And Net Revenue [Line Items]
Concentration risk		10.50%		11.70%
Net Revenue | Payor D
Accounts Receivable And Net Revenue [Line Items]
Concentration risk	17.50%	13.70%	17.50%
Net Revenue | Payor E
Accounts Receivable And Net Revenue [Line Items]
Concentration risk	12.40%		12.90%
Net Revenue | Payor G
Accounts Receivable And Net Revenue [Line Items]
Concentration risk	10.10%		10.30%
Receivables and Receivables-Related Parties | Payor D
Accounts Receivable And Net Revenue [Line Items]
Concentration risk			12.40%
Receivables and Receivables-Related Parties | Payor G
Accounts Receivable And Net Revenue [Line Items]
Concentration risk			33.50%		30.40%
Receivables and Receivables-Related Parties | Payor H
Accounts Receivable And Net Revenue [Line Items]
Concentration risk			35.10%		36.00%