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v3.21.1

Commitments and contingencies - Additional Information (Detail) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Collaboration Agreements [Member] |  |
Statements [Line Items] |  |
Unrecorded contingent liability | € 1.6 | € 1.6

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

X
- Definition Unrecorded contingent liability. + References No definition available. + Details
Name: | imtx_UnrecordedContingentLiability
Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | imtx_AgreementAxis=imtx_CollaborationAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |