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v3.22.1

Intangible Asset, net - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2022
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Reservation right amortized term | 3 years

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- Definition Reservation right amortized term. + References No definition available. + Details
Name: | itrm_ReservationRightAmortizedTerm
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_IntangibleAssetsNetExcludingGoodwillAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration