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Accounts receivable - Summary of Trade receivables (Detail) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Trade and other current receivables [abstract] |  |  |
Receivables From Collaboration Agreements | € 1,250 | € 957 |
Accounts receivable | € 1,250 | € 957 | [1]
[1] | See Note 2 for details regarding the change in presentation of Other financial assets

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- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_68&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Receivables from collaboration agreements. + References No definition available. + Details
Name: | imtx_ReceivablesFromCollaborationAgreements
Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant