Fair Value Measurements - Schedule of Marketable Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	$ 84,007	$ 78,573
Gross Unrealized Gains	749	123
Gross Unrealized Losses	(1,670)	(3,056)
Estimated Fair Value	83,086	75,640
Credit Impairment Losses	0	0
Unrestricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	54,597	53,531
Gross Unrealized Gains	136	0
Gross Unrealized Losses	(1,660)	(2,996)
Estimated Fair Value	53,073	50,535
Credit Impairment Losses	0	0
Unrestricted | Municipal bonds — taxable
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	11,751	10,276
Gross Unrealized Gains	18	0
Gross Unrealized Losses	(337)	(676)
Estimated Fair Value	11,432	9,600
Credit Impairment Losses	0	0
Unrestricted | Municipal bonds — non-taxable
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	42,846	43,255
Gross Unrealized Gains	118	0
Gross Unrealized Losses	(1,323)	(2,320)
Estimated Fair Value	41,641	40,935
Credit Impairment Losses	0	0
Restricted
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	29,410	25,042
Gross Unrealized Gains	613	123
Gross Unrealized Losses	(10)	(60)
Estimated Fair Value	30,013	25,105
Credit Impairment Losses	0	0
Restricted | Municipal bonds — taxable
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	9,178	9,131
Gross Unrealized Gains	267	40
Gross Unrealized Losses	(1)	(41)
Estimated Fair Value	9,444	9,130
Credit Impairment Losses	0	0
Restricted | U.S. treasury bonds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	9,699	7,276
Gross Unrealized Gains	153	38
Gross Unrealized Losses	(9)	(5)
Estimated Fair Value	9,843	7,309
Credit Impairment Losses	0	0
Restricted | U.S. government agency bonds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	1,223	1,208
Gross Unrealized Gains	7	10
Gross Unrealized Losses	0	0
Estimated Fair Value	1,230	1,218
Credit Impairment Losses	0	0
Restricted | International fixed income bonds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	729	647
Gross Unrealized Gains	4	5
Gross Unrealized Losses	0	0
Estimated Fair Value	733	652
Credit Impairment Losses	0	0
Restricted | Corporate bonds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	8,581	6,780
Gross Unrealized Gains	182	30
Gross Unrealized Losses	0	(14)
Estimated Fair Value	8,763	6,796
Credit Impairment Losses	$ 0	$ 0