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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) | 5 Months Ended | 12 Months Ended |
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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 |  |  |  |

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