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Commitments and Contingencies - Concentration Risk (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Percentage of cash and cash equivalents held with FDIC participating bank		99.60%
Cash and cash equivalents (including restricted cash)	[1]	$ 262,786	$ 303,769	$ 354,942	$ 361,564
Percentage of cash held in international banks (less than)		0.40%
Discontinued Operations, Disposed of by Sale | True Health
Concentration Risk [Line Items]
Revenue			44,833
Premiums | Discontinued Operations, Disposed of by Sale | True Health
Concentration Risk [Line Items]
Revenue			$ 44,795
Florida Blue Medicare, Inc. | Customer Concentration Risk | Accounts Receivable | Customer Receivable
Concentration Risk [Line Items]
Concentration risk (in percent)		35.30%		46.40%
Florida Blue Medicare, Inc. | Customer Concentration Risk | Revenues
Concentration Risk [Line Items]
Concentration risk (in percent)		11.90%	14.70%
Cook County Health and Hospitals System | Customer Concentration Risk | Accounts Receivable | Customer Receivable
Concentration Risk [Line Items]
Concentration risk (in percent)		27.90%
Cook County Health and Hospitals System | Customer Concentration Risk | Revenues
Concentration Risk [Line Items]
Concentration risk (in percent)		23.90%	28.80%
Molina Healthcare | Customer Concentration Risk | Accounts Receivable | Customer Receivable
Concentration Risk [Line Items]
Concentration risk (in percent)				10.40%
[1] As a result of the closing of the sale of True Health during the first quarter of 2021, the consolidated statement of operations and related financial information reflect the Company’s operations and assets and liabilities of True Health as discontinued operations. Cash flows and comprehensive income have not been adjusted and are included in the consolidated statements of cash flows and consolidated statements of comprehensive income (loss) for the three months ended March 31, 2021. See Note 5.

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