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Other income - Summary of other income (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Other income [Abstract] |  |
Receivables | € 875 | € 998
Deferred income | 0 | 164
Total | € 875 | € 1,162

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- Definition Deferred income current + References No definition available. + Details
Name: | imtx_DeferredIncomeCurrent
Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Government grant receivable. + References No definition available. + Details
Name: | imtx_GovernmentGrantReceivable
Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total deferred income. + References No definition available. + Details
Name: | imtx_TotalDeferredIncome
Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration