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Related party disclosures - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2022 shares
Key Management Personnel And Board Of Directors [Member] | Service Options [Member]
Disclosure of transactions between related parties [line items]
Related Party Transaction Options Granted	340,000

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

X

- Definition

Related party transaction options granted.

+ References

No definition available.

+ Details

Name:	imtx_RelatedPartyTransactionOptionsGranted
Namespace Prefix:	imtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=imtx_KeyManagementPersonnelAndBoardOfDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	imtx_TypeOfVestingAxis=imtx_ServiceOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: