Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	5 Months Ended	12 Months Ended
	Aug. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) segment unit	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 01, 2019 USD ($)
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		$ 294,900,000	$ 226,500,000
Restricted cash		0	100,000
Amount of short-term marketable securities		67,695,000	116,539,000
Impairment of finite-lived intangible assets		$ 0	0
Number of main reporting units | unit		3
Impairment of goodwill and intangible assets		$ 0	1,994,000	$ 3,799,000
Impairment of intangible assets		0	1,994,000
Impairment of goodwill		0
Billing in excess of costs				7,800,000	$ 34,500,000
Risk pool settlement			19,800,000	$ 900,000
Payment of revenue, monthly amount	$ 8,300,000	7,200,000
AIPBP payments						$ 3,700,000
Payment of revenue, revenue recognized		75,100,000
Contract liabilities		12,988,000	8,892,000
Contract liability repaid, capitation received and not earned		$ 8,500,000
Voting rights held (more than)		50.00%
Accounts Payable and Accrued Expenses
Summary Of Significant Accounting Policies [Line Items]
Payment of revenue		$ 85,900,000
Revenue recognized		$ 400,000
CMS
Summary Of Significant Accounting Policies [Line Items]
Expected period of payment upon termination of agreement		30 days
PMPM
Summary Of Significant Accounting Policies [Line Items]
Contract term		one year
Management contracts
Summary Of Significant Accounting Policies [Line Items]
Contract term		ten years
NGACO
Summary Of Significant Accounting Policies [Line Items]
Contract liabilities		$ 12,600,000	8,500,000
APAACO
Summary Of Significant Accounting Policies [Line Items]
Estimated revenue percentage					100.00%
PASC
Summary Of Significant Accounting Policies [Line Items]
Impairment of investments		$ 0	300,000
Medicare license
Summary Of Significant Accounting Policies [Line Items]
Indefinite-lived assets written off			2,000,000.0
Impairment of intangible assets			$ 1,994,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		39 years