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Subsequent Events - Additional Information (Details) $ in Thousands | Aug. 14, 2018 USD ($)
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Pfizer License Agreement | SUlopenem for Resistant Enterobacteriaceae (SURE) 1 | Subsequent Event |
Subsequent Event [Line Items] |
Liability on achieving milestones | $ 7,500

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- Definition Liability to be record on achieving regulatory or sales milestones. + References No definition available. + Details
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Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis=itrm_SUlopenemForResistantEnterobacteriaceaeOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |