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v3.22.1

Short-term Investments - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2022
Investments Debt And Equity Securities [Abstract] |
Average maturity period | 10 months 20 days

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- Definition Short-term investments average 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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration