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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 ($)
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

Name:	itrm_RefundableFDAFilingFeeReceived
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