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Related party disclosures - Additional Information (Detail) | 6 Months Ended
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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

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- 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

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- 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

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

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