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Fair Value Measurements - Marketable Debt Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | $ 78,573 | $ 95,466
Gross Unrealized Gains | 123 | 387
Gross Unrealized Losses | (3,056) | (2,722)
Estimated Fair Value | 75,640 | 93,131
Credit Impairment Losses | 0 | 0
Municipal bonds — non-taxable |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost |  | 95,466
Gross Unrealized Gains |  | 387
Gross Unrealized Losses |  | (2,722)
Estimated Fair Value |  | 93,131
Credit Impairment Losses |  | 0
Unrestricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 53,531 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (2,996) |
Estimated Fair Value | 50,535 | 93,131
Credit Impairment Losses | 0 |
Unrestricted | Municipal bonds — taxable |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 10,276 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (676) |
Estimated Fair Value | 9,600 |
Credit Impairment Losses | 0 |
Unrestricted | Municipal bonds — non-taxable |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 43,255 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (2,320) |
Estimated Fair Value | 40,935 |
Credit Impairment Losses | 0 |
Restricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 25,042 |
Gross Unrealized Gains | 123 |
Gross Unrealized Losses | (60) |
Estimated Fair Value | 25,105 | $ 0
Credit Impairment Losses | 0 |
Restricted | Municipal bonds — taxable |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 9,131 |
Gross Unrealized Gains | 40 |
Gross Unrealized Losses | (41) |
Estimated Fair Value | 9,130 |
Credit Impairment Losses |  |
Restricted | U.S. treasury bonds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 7,276 |
Gross Unrealized Gains | 38 |
Gross Unrealized Losses | (5) |
Estimated Fair Value | 7,309 |
Credit Impairment Losses |  |
Restricted | U.S. government agency bonds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 1,208 |
Gross Unrealized Gains | 10 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 1,218 |
Credit Impairment Losses |  |
Restricted | International fixed income bonds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 647 |
Gross Unrealized Gains | 5 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 652 |
Credit Impairment Losses |  |
Restricted | Corporate bonds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 6,780 |
Gross Unrealized Gains | 30 |
Gross Unrealized Losses | (14) |
Estimated Fair Value | 6,796 |
Credit Impairment Losses |  |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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