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Fair Value Measurements - Marketable Debt Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | $ 102,525 | $ 95,466
Gross Unrealized Gains | 1,489 | 387
Gross Unrealized Losses | (2,153) | (2,722)
Estimated Fair Value | 101,861 | 93,131
Credit Impairment Losses | 0 | 0
Unrestricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 78,168 |
Gross Unrealized Gains | 761 |
Gross Unrealized Losses | (2,153) |
Estimated Fair Value | 76,776 | 93,131
Credit Impairment Losses | 0 |
Restricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 24,357 |
Gross Unrealized Gains | 728 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 25,085 | 0
Credit Impairment Losses | 0 |
Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 0 |
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 76,776 |
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 0 |
Carrying Amount |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 76,776 |
Total Fair Value |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 76,776 |
U.S. treasury bonds | Restricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 6,921 |
Gross Unrealized Gains | 148 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 7,069 |
Credit Impairment Losses | 0 |
U.S. government agency bonds | Restricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 1,223 |
Gross Unrealized Gains | 20 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 1,243 |
Credit Impairment Losses | 0 |
International fixed income bonds | Restricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 643 |
Gross Unrealized Gains | 11 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 654 |
Credit Impairment Losses | 0 |
Corporate bonds | Restricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 6,451 |
Gross Unrealized Gains | 211 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 6,662 |
Credit Impairment Losses | 0 |
Municipal bonds — taxable | Unrestricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 11,690 |
Gross Unrealized Gains | 97 |
Gross Unrealized Losses | (507) |
Estimated Fair Value | 11,280 |
Credit Impairment Losses | 0 |
Municipal bonds — taxable | Restricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 9,119 |
Gross Unrealized Gains | 338 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 9,457 |
Credit Impairment Losses | 0 |
Municipal bonds — taxable | Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 0 |
Municipal bonds — taxable | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 11,280 |
Municipal bonds — taxable | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 0 |
Municipal bonds — taxable | Carrying Amount |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 11,280 |
Municipal bonds — taxable | Total Fair Value |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 11,280 |
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
Municipal bonds — non-taxable | Unrestricted |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Amortized Cost | 66,478 |
Gross Unrealized Gains | 664 |
Gross Unrealized Losses | (1,646) |
Estimated Fair Value | 65,496 |
Credit Impairment Losses | 0 |
Municipal bonds — non-taxable | Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 0 | 0
Municipal bonds — non-taxable | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 65,496 | 93,131
Municipal bonds — non-taxable | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 0 | 0
Municipal bonds — non-taxable | Carrying Amount |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | 65,496 | 93,131
Municipal bonds — non-taxable | Total Fair Value |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Estimated Fair Value | $ 65,496 | $ 93,131

X
- 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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- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost of 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 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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