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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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