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

X

- Definition

Liability to be record on achieving regulatory or sales milestones.

+ References

No definition available.

+ Details

Name:	itrm_MilestoneLiabilityToBeRecord
Namespace Prefix:	itrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=itrm_PfizerLicenseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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