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Short Term Investments - Additional Information (Details)	6 Months Ended
	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

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Namespace Prefix:	itrm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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