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Investments - Schedule of Amortized Cost and Estimated Fair Value of Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |
Amortized Cost | $ 346,031 | $ 214,505 |
Allowance for Credit Loss | 0 | 0 | $ 0
Gross Unrealized Gains | 2,696 | 426 |
Gross Unrealized Losses | (117) | (886) |
Estimated Fair Value | 348,610 | 214,045 |
U.S. Treasury and U.S. government agencies |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |
Amortized Cost | 30,646 | 75,532 |
Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains | 76 | 0 |
Gross Unrealized Losses | 0 | (298) |
Estimated Fair Value | 30,722 | 75,234 |
Corporate debt securities |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |
Amortized Cost | 205,109 | 109,174 |
Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains | 1,793 | 164 |
Gross Unrealized Losses | (103) | (548) |
Estimated Fair Value | 206,799 | 108,790 |
Asset-backed securities |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |
Amortized Cost | 92,155 | 29,799 |
Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains | 826 | 262 |
Gross Unrealized Losses | (13) | (40) |
Estimated Fair Value | 92,968 | 30,021 |
Total fixed maturity securities |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |
Amortized Cost | 327,910 | 214,505 |
Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains | 2,695 | 426 |
Gross Unrealized Losses | (116) | (886) |
Estimated Fair Value | 330,489 | 214,045 |
Short-term investments |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |
Amortized Cost | 18,121 | $ 0 |
Allowance for Credit Loss | 0 |  |
Gross Unrealized Gains | 1 |  |
Gross Unrealized Losses | (1) |  |
Estimated Fair Value | $ 18,121 |  |

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