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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES BASIS OF PRESENTATION AND PRINCIPLES OF CONSOLIDATION - Future Milestone and Royalty Assets (Details) $ in Millions | Jun. 30, 2026 USD ($)
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Accounting Policies [Abstract] |
Future contingent milestone and royalty assets | $ 3.0

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- Definition Future Contingent Milestone and Royalty Assets + References No definition available. + Details
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Namespace Prefix: | rlyb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration