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Accounts payable - Additional Information (Detail) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Trade and other current payables [abstract] |  |
Other accrued liabilities | € 7,498 | € 2,216

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

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- Definition Other accrued liabilities. + References No definition available. + Details
Name: | imtx_OtherAccruedLiabilities
Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant