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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
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

X

- 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

X

- 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

X

- Definition

Gross proceeds from issue of securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	imtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: