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Other current liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020
Non Interest Bearing Liability [Member]
Disclosure of detailed information about other current liabilities [Line Items]
Borrowings maturity	one year

X

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_BorrowingsMaturity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of detailed information about other current liabilities line items.

+ References

No definition available.

+ Details

Name:	imtx_DisclosureOfDetailedInformationAboutOtherCurrentLiabilitiesLineItems
Namespace Prefix:	imtx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=imtx_NonInterestBearingLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: