Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Segment Entity	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Line Items]
Number of consolidated variable interest entities | Entity			4
Additional Paid in Capital, Common Stock						$ 7,837
Number of reporting segments | Segment			1
Number of operating segments | Segment			1
Assets, fair value disclosure	$ 2,847		$ 2,847		$ 2,446
Net loss attributable to noncontrolling interest	0	$ 0	0	$ 0
Federal deposit insurance corporation premium expense			$ 565,838		465,824
Award requisite service period			4 years
Revenues	359,978	293,275	$ 1,071,450	869,014
Deferred premium revenue	116,767		116,767		469
Level 3
Accounting Policies [Line Items]
Assets, fair value disclosure	0		0		0
Liabilities, fair value disclosure	0		0		$ 0
Directly from CMS
Accounting Policies [Line Items]
Revenues	$ 12,341	$ 11,948	$ 37,753	$ 25,400
Medicare Advantage Plan
Accounting Policies [Line Items]
Percentage of consumer discounts on brand name			75.00%
Medicare Advantage Plan | Minimum
Accounting Policies [Line Items]
Loss ratio			85.00%