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FAIR VALUE MEASUREMENT - Schedule of Fair Value of Commercial Paper and Corporate Bonds (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Level 2 | Restricted Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value on a recurring basis	$ 12,904	$ 64,580
Level 2 | Restricted Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value on a recurring basis	33,905	8,168
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value on a recurring basis	13,873	65,979
Commercial paper | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value on a recurring basis	13,873	65,979
Commercial paper | Level 2 | Restricted Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value on a recurring basis	12,904	64,580
Commercial paper | Level 2 | Restricted Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value on a recurring basis	969	1,399
Corporate bonds | Level 2 | Restricted Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value on a recurring basis	$ 32,936	$ 6,769

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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Fair value of asset after deduction of liability.

+ References

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-Section 50
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