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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Fair Value Disclosures [Abstract] |  |
Transfers between levels of fair value hierarchy | $ 0 | $ 0

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- Definition Fair value measurement transfers between with levels of hierarchy for assets and liabilities held. + References No definition available. + Details
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Namespace Prefix: | mchb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration