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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Accounting Policies [Abstract] |  |
Factoring receivable | $ 4.2 | $ 14.3

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- Definition Contracts Receivable, Factoring Receivable + References No definition available. + Details
Name: | rdnt_ContractsReceivableFactoringReceivable
Namespace Prefix: | rdnt_
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