Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) reportingUnit segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Line Items]
Number of reporting segments (in segments) | segment	2
Other than temporary impairment losses	$ 0	$ 0	$ 0
Amortization expense due to recognition of premium deficiency reserve	$ 0	0
Number of reporting units (in reporting units) | reportingUnit	1
Impairment of goodwill	$ 0	0	0
Allowances for uncollectible reinsurance recoverable	0	0
HIF paid	0	0	8,022,000
Interest and penalties incurred related to uncertain tax positions	$ 0	0	0
Minimum
Accounting Policies [Line Items]
Useful lives of property and equipment, net	3 years
Maximum
Accounting Policies [Line Items]
Useful lives of property and equipment, net	7 years
General and Administrative Expense
Accounting Policies [Line Items]
Amortization expense of deferred acquisition costs	$ 16,300,000	$ 10,700,000	$ 0