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Royalty Linked Notes - Summary of Royalty-Linked Notes (Details) - USD ($) $ in Thousands | 59 Months Ended | 68 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2025 | Sep. 08, 2020
Royalty Linked Notes [Abstract] |  |  |
Total liability related to the sale of future royalties, on inception | $ 10,990 | $ 10,990 |
Liability related to the sale of future royalties, arising from the Rights Offering |  |  | $ 51
Amortization of discount and debt issuance costs | 3,666 | 3,666 |
Adjustments to fair value | (3,936) | (2,129) |
Repayments |  | (58) |
Total liability related to the sale of future royalties | 10,771 | 12,520 |
Current portion of royalty-linked notes |  | 281 |
Long-term Portion | $ 10,771 | $ 12,239 |

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- Definition Adjustments to fair value related to sale of future royalties. + References No definition available. + Details
Name: | itrm_AdjustmentsToFairValueRelatedToSaleOfFutureRoyalties
Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amortization of discount and debt issuance costs related to sale of future royalties. + References No definition available. + Details
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Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Liability related to the sale of future royalties. + References No definition available. + Details
Name: | itrm_LiabilityRelatedToSaleOfFutureRoyalties
Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liability related to sale of future royalties arising from rights offering. + References No definition available. + Details
Name: | itrm_LiabilityRelatedToSaleOfFutureRoyaltiesArisingFromRightsOffering
Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repayment related to sale of future royalties. + References No definition available. + Details
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Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Royalty linked notes. + References No definition available. + Details
Name: | itrm_RoyaltyLinkedNotesAbstract
Namespace Prefix: | itrm_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Royalty-linked notes, current. + References No definition available. + Details
Name: | itrm_RoyaltyLinkedNotesCurrent
Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty-linked notes noncurrent. + References No definition available. + Details
Name: | itrm_RoyaltyLinkedNotesNoncurrent
Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant