Investments - Schedule of Amortized Cost and Estimated Fair Value of Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Amortized Cost	$ 351,728	$ 346,031
Allowance for Credit Loss	0	0
Gross Unrealized Gains	374	2,696
Gross Unrealized Losses	(937)	(117)
Estimated Fair Value	351,165	348,610
U.S. Treasury and U.S. government agencies
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Amortized Cost	30,701	30,646
Allowance for Credit Loss	0	0
Gross Unrealized Gains	1	76
Gross Unrealized Losses	(32)	0
Estimated Fair Value	30,670	30,722
Corporate debt securities
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Amortized Cost	182,207	205,109
Allowance for Credit Loss	0	0
Gross Unrealized Gains	107	1,793
Gross Unrealized Losses	(323)	(103)
Estimated Fair Value	181,991	206,799
Asset-backed securities
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Amortized Cost	134,081	92,155
Allowance for Credit Loss	0	0
Gross Unrealized Gains	266	826
Gross Unrealized Losses	(581)	(13)
Estimated Fair Value	133,766	92,968
Total fixed maturity securities
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Amortized Cost	346,989	327,910
Allowance for Credit Loss	0	0
Gross Unrealized Gains	374	2,695
Gross Unrealized Losses	(936)	(116)
Estimated Fair Value	346,427	330,489
Short-term investments
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Amortized Cost	4,739	18,121
Allowance for Credit Loss	0	0
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	$ 4,738	$ 18,121

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cumulative unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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