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v3.21.1

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

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- 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

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- 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

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