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Leases - Summary of Right-of-Use Assets and Lease Liabilities for Operating Leases Recorded in Condensed Consolidated Balance Sheet (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
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Schedule Of Lease Assets And Liabilities [Abstract] |  |
Prepaid expenses and other current assets | $ 0 | $ 65,000
Operating Lease, Right-of-Use Asset, Current, Statement of Financial Position [Extensible Enumeration] |  | Prepaid Expense and Other Assets, Current
Other current liabilities | $ 0 | $ 67,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  | Other current liabilities

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- Definition Operating lease right of use asset current. + References No definition available. + Details
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Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Operating lease, right-of-use asset, current, statement of financial position + References No definition available. + Details
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Namespace Prefix: | itrm_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

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- Definition Schedule of lease assets and liabilities. + References No definition available. + Details
Name: | itrm_ScheduleOfLeaseAssetsAndLiabilitiesAbstract
Namespace Prefix: | itrm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Indicates line item in statement of financial position that includes current operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-2 + Details
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Data Type: | enum2:enumerationSetItemType
Balance Type: | na
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