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Events occurring after the reporting period - Additional Information (Detail) - Issue Of Securities [Member] - SVB Securities LLC [Member] - At The Market Agreement [Member] € in Millions, shares in Millions, $ in Millions | Aug. 09, 2022 EUR (€) shares | Aug. 09, 2022 USD ($) shares
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Events Occurring After The Reporting Period [Line Items] |  |
Gross proceeds from issue of securities | € 3.7 | $ 3.8
Number of shares issued | 0.4 | 0.4

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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Events occurring after the reporting period. + References No definition available. + Details
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Namespace Prefix: | imtx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross proceeds from issue of securities. + References No definition available. + Details
Name: | imtx_GrossProceedsFromIssueOfSecurities
Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | imtx_InvesteeAxis=imtx_SvbSecuritiesLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | imtx_AgreementAxis=imtx_AtTheMarketAgreementMember
Namespace Prefix: |
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Balance Type: |
Period Type: |