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v3.21.1

Summary of accounting policies applied by the Group for the annual reporting period ending December 31, 2020 - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020
Bottom of range [member] |
Statements [Line Items] |
Rental Contract Term | two
Top of range [member] |
Statements [Line Items] |
Rental Contract Term | seven

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- Definition Rental contract term. + References No definition available. + Details
Name: | imtx_RentalContractTerm
Namespace Prefix: | imtx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |