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Royalty Linked Notes - Summary of Royalty-Linked Notes (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Royalty Linked Notes [Abstract] |  |
Total liability related to the sale of future royalties, on inception | $ 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 |
Adjustments to fair value | 310 |
Total liability related to the sale of future royalties at March 31, 2022 | 14,397 |
Long-term Portion | $ 14,397 | $ 17,968

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- Definition Adjustments to fair value 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
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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
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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
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Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Royalty linked notes. + References No definition available. + Details
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Namespace Prefix: | itrm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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