Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) Entity Segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Line Items]
Number of consolidated variable interest entities | Entity	3
Additional Paid in Capital, Common Stock				$ 7,838,000
Number of reporting segments | Segment	1
Number of operating segments | Segment	1
Assets, fair value disclosure	$ 2,547,000		$ 2,446,000
Net loss attributable to noncontrolling interest	0	$ 0
Federal deposit insurance corporation premium expense	$ 447,711,000		465,824,000
Award requisite service period	4 years
Revenues	$ 345,292,000	267,000,000
Level 3
Accounting Policies [Line Items]
Assets, fair value disclosure	0	0	0
Liabilities, fair value disclosure	0	$ 0
Directly from CMS
Accounting Policies [Line Items]
Revenues	12,302,000
Medicare Advantage Plan
Accounting Policies [Line Items]
Minimum loss ratio amounts payable	$ 0		$ 0
Percentage of consumer discounts on brand name	75.00%
Medicare Advantage Plan | Minimum
Accounting Policies [Line Items]
Loss ratio	85.00%