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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 |  |  |

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