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Short Term Investments - Additional Information (Details) | 6 Months Ended
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Jun. 30, 2018
Available For Sale Securities [Abstract] |
Short term investments maturity period | 4 months 28 days

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- Definition Short term investments maturity period. + References No definition available. + Details
Name: | itrm_ShortTermInvestmentsMaturityPeriod
Namespace Prefix: | itrm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration