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Commitments and Contingencies - Concentration Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |  |  |  |  |
Percentage of cash and cash equivalents held with FDIC participating bank |  |  |  | 99.40% |  |  |
Cash and cash equivalents (including restricted cash) | [1] |  | $ 361,581 | $ 354,942 | $ 361,581 | $ 128,531 | $ 388,325
Percentage of cash held in international banks (less than) |  |  |  | 0.60% |  |  |
Discontinued Operations, Disposed of by Sale | True Health |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Revenue |  |  |  | $ 44,833 | 117,733 | 171,887 |
Premiums | Discontinued Operations, Disposed of by Sale | True Health |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Revenue |  |  | $ 44,800 | $ 44,795 | $ 117,377 | $ 171,742 |
Cook County Health and Hospitals System | Customer Concentration Risk | Accounts Receivable | Customer Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  | 61.50% |  |  |  |  |
Cook County Health and Hospitals System | Customer Concentration Risk | Revenues |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  |  |  | 28.00% | 22.30% | 11.60% |
Florida Blue Medicare, Inc. | Customer Concentration Risk | Accounts Receivable | Customer Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  |  |  | 46.40% |  |  |
Florida Blue Medicare, Inc. | Customer Concentration Risk | Revenues |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  |  |  | 14.10% |  |  |
New Mexico Health Connections | Customer Concentration Risk | Revenues |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  | 13.40% |
Passport | Customer Concentration Risk | Revenues |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  |  |  |  | 19.00% | 23.00% |
Molina Healthcare | Customer Concentration Risk | Accounts Receivable | Customer Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  |  |  | 10.40% |  |  |
Molina Healthcare | Customer Concentration Risk | Revenues |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk |  |  |  |  | 9.70% |  |
[1] | See Note 5.

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