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Fair Value Measurements - Marketable Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	$ 104,468	$ 95,466
Gross Unrealized Gains	103	387
Gross Unrealized Losses	(3,415)	(2,722)
Estimated Fair Value	101,156	93,131
Credit Impairment Losses	0	0
Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	82,458
Gross Unrealized Gains	67
Gross Unrealized Losses	(3,391)
Estimated Fair Value	79,134	93,131
Credit Impairment Losses	0
Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	22,010
Gross Unrealized Gains	36
Gross Unrealized Losses	(24)
Estimated Fair Value	22,022	0
Credit Impairment Losses	0
Quoted Prices in Active Markets (Level 1) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Quoted Prices in Active Markets (Level 1) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Significant Other Observable Inputs (Level 2) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	79,134
Significant Other Observable Inputs (Level 2) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	22,022
Significant Unobservable Inputs (Level 3) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Significant Unobservable Inputs (Level 3) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Carrying Amount | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	79,134
Carrying Amount | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	22,022
Total Fair Value | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	79,134
Total Fair Value | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	22,022
Municipal bonds — taxable | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	9,242
Gross Unrealized Gains	18
Gross Unrealized Losses	(752)
Estimated Fair Value	8,508
Credit Impairment Losses	0
Municipal bonds — taxable | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	8,156
Gross Unrealized Gains	16
Gross Unrealized Losses	(21)
Estimated Fair Value	8,151
Credit Impairment Losses	0
Municipal bonds — taxable | Quoted Prices in Active Markets (Level 1) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Municipal bonds — taxable | Quoted Prices in Active Markets (Level 1) | Restricted
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) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	8,508
Municipal bonds — taxable | Significant Other Observable Inputs (Level 2) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	8,151
Municipal bonds — taxable | Significant Unobservable Inputs (Level 3) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Municipal bonds — taxable | Significant Unobservable Inputs (Level 3) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Municipal bonds — taxable | Carrying Amount | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	8,508
Municipal bonds — taxable | Carrying Amount | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	8,151
Municipal bonds — taxable | Total Fair Value | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	8,508
Municipal bonds — taxable | Total Fair Value | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	8,151
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	73,216
Gross Unrealized Gains	49
Gross Unrealized Losses	(2,639)
Estimated Fair Value	70,626
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
Municipal bonds — non-taxable | Quoted Prices in Active Markets (Level 1) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	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		93,131
Municipal bonds — non-taxable | Significant Other Observable Inputs (Level 2) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	70,626
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
Municipal bonds — non-taxable | Significant Unobservable Inputs (Level 3) | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Municipal bonds — non-taxable | Carrying Amount
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value		93,131
Municipal bonds — non-taxable | Carrying Amount | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	70,626
Municipal bonds — non-taxable | Total Fair Value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value		$ 93,131
Municipal bonds — non-taxable | Total Fair Value | Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	70,626
U.S. treasury bonds | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	6,888
Gross Unrealized Gains	13
Gross Unrealized Losses	0
Estimated Fair Value	6,901
Credit Impairment Losses	0
U.S. treasury bonds | Quoted Prices in Active Markets (Level 1) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
U.S. treasury bonds | Significant Other Observable Inputs (Level 2) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	6,901
U.S. treasury bonds | Significant Unobservable Inputs (Level 3) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
U.S. treasury bonds | Carrying Amount | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	6,901
U.S. treasury bonds | Total Fair Value | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	6,901
U.S. government agency bonds | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	1,207
Gross Unrealized Gains	2
Gross Unrealized Losses	0
Estimated Fair Value	1,209
Credit Impairment Losses	0
U.S. government agency bonds | Quoted Prices in Active Markets (Level 1) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
U.S. government agency bonds | Significant Other Observable Inputs (Level 2) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	1,209
U.S. government agency bonds | Significant Unobservable Inputs (Level 3) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
U.S. government agency bonds | Carrying Amount | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	1,209
U.S. government agency bonds | Total Fair Value | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	1,209
International fixed income bonds | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	625
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Estimated Fair Value	624
Credit Impairment Losses	0
International fixed income bonds | Quoted Prices in Active Markets (Level 1) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
International fixed income bonds | Significant Other Observable Inputs (Level 2) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	624
International fixed income bonds | Significant Unobservable Inputs (Level 3) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
International fixed income bonds | Carrying Amount | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	624
International fixed income bonds | Total Fair Value | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	624
Corporate bonds | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	5,134
Gross Unrealized Gains	5
Gross Unrealized Losses	(2)
Estimated Fair Value	5,137
Credit Impairment Losses	0
Corporate bonds | Quoted Prices in Active Markets (Level 1) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Corporate bonds | Significant Other Observable Inputs (Level 2) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	5,137
Corporate bonds | Significant Unobservable Inputs (Level 3) | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	0
Corporate bonds | Carrying Amount | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	5,137
Corporate bonds | Total Fair Value | Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated Fair Value	$ 5,137

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).

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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).

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