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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Significant Accounting Policies [Line Items]
Accrued interest receivable on available-for-sale securities	$ 8,300,000	$ 7,000,000
Assets held for sale		0	$ 0
Allowances for doubtful accounts	600,000	900,000
Accruals for premium deficiency	0	0
Estimated credit loss allowance	$ 0	$ 0
Software
Schedule Of Significant Accounting Policies [Line Items]
Useful life of property and equipment	3 years
Minimum
Schedule Of Significant Accounting Policies [Line Items]
Useful life of property and equipment	3 years
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Useful life of property and equipment	27 years 6 months

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