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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Parenthetical) (Details) $ in Thousands | Jan. 31, 2021 USD ($)
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Prepaid Expense And Other Assets Current [Abstract] |
Refundable FDA filing fee received | $ 2,876

X
- Definition Refundable FDA filing fee received. + References No definition available. + Details
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Namespace Prefix: | itrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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