Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) segment unit	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment		1
Number of reportable segments | segment		1
Amount deposit accounts exceeded FDIC insured limit	$ 290,900,000	$ 290,900,000
Amount of short-term marketable securities	117,656,000	$ 117,656,000			$ 116,539,000
Risk pool surplus or deficits, settlement period after risk pool performance year		18 months
Allowance for doubtful accounts	1,300,000	$ 1,300,000			2,900,000
Impairment of finite-lived intangible assets		0	$ 0
Impairment of long-lived assets		$ 0	0
Number of main reporting units | unit		3
Impairment of goodwill		$ 0	0
Impairment of indefinite-lived intangible assets		0	$ 0
Payments received, monthly		7,600,000
Payments received	22,900,000	45,500,000
Accrued contract liability recognized	20,500,000	42,400,000
Contract liabilities	3,061,000	$ 3,061,000			$ 8,892,000
Investment deposit				$ 4,000,000.0
Voting rights held (more than)		50.00%
Other Receivables, Final Settlement 2018 Performance Year
Summary Of Significant Accounting Policies [Line Items]
Recoverable claims paid	3,200,000	$ 3,200,000
Other Receivables
Summary Of Significant Accounting Policies [Line Items]
Recoverable claims paid	8,500,000	8,500,000
Accounts Payable and Accrued Expenses
Summary Of Significant Accounting Policies [Line Items]
Accrued contract liability recognized		400,000
Contract liability repaid, capitation received and not earned		$ 8,500,000
PMPM Managed Care Contract
Summary Of Significant Accounting Policies [Line Items]
Contract term		one year
Management Fee Income Contract
Summary Of Significant Accounting Policies [Line Items]
Contract term		10 years
CMS
Summary Of Significant Accounting Policies [Line Items]
Expected period of payment upon termination of agreement		30 days
Minimum
Summary Of Significant Accounting Policies [Line Items]
Short-term marketable securities, maturity period		4 months
Maximum
Summary Of Significant Accounting Policies [Line Items]
Short-term marketable securities, maturity period		24 months
Certificates of Deposit
Summary Of Significant Accounting Policies [Line Items]
Amount of short-term marketable securities	$ 117,600,000	$ 117,600,000