v3.25.4

INCOME TAXES - Narrative (Details) - USD ($)	12 Months Ended
INCOME TAXES - Narrative (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jun. 05, 2025
Valuation Allowance [Line Items]
Valuation allowance	$ 109,161,000	$ 93,644,000
Valuation allowance, deferred tax asset, increase (decrease), amount	15,500,000	(24,400,000)
Unrecognized tax benefits, income tax penalties and interest expense	100,000	100,000	$ 0
Unrecognized tax benefits, income tax penalties and interest accrued	100,000	100,000
UNITED STATES
Valuation Allowance [Line Items]
Operating loss carryforwards	257,600,000	241,800,000
Operating loss carryforwards, subject to expiration	33,700,000	54,500,000
Operating loss carryforwards, not subject to expiration	223,900,000	187,300,000
Tax credit carryforward, amount	10,800,000	2,300,000
State and local
Valuation Allowance [Line Items]
Operating loss carryforwards	244,700,000	$ 217,200,000
Operating loss carryforwards, subject to expiration	235,400,000
Operating loss carryforwards, not subject to expiration	9,400,000
Tax credit carryforward, amount	$ 5,000,000.0
TISEG
Valuation Allowance [Line Items]
Deferred tax liability				$ 11,227,000

Operating Loss Carryforwards, Not Subject To Expiration

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- Definition

Amount of deferred tax liability assumed in business combination and recognized at acquisition date.

+ References

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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MIAMI INTERNATIONAL HOLDINGS, INC. 10-K