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Commitments and contingencies - Additional Information (Detail) - EUR (€) € in Millions	Dec. 31, 2020	Dec. 31, 2019
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: