XML 103 R64.htm IDEA: XBRL DOCUMENT v3.21.1

Summary of accounting policies applied by the Group for the annual reporting period ending December 31, 2020 - Summary of useful life of intangible assets other than goodwill (Detail)	12 Months Ended
	Dec. 31, 2020
Licences [member] | Bottom of range [member]
Disclosure Of Detailed Information About Useful Life Measured As Period Of Time Intangible Assets Other Than Goodwill [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	5 years
Licences [member] | Top of range [member]
Disclosure Of Detailed Information About Useful Life Measured As Period Of Time Intangible Assets Other Than Goodwill [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	30 years
Computer software [member] | Bottom of range [member]
Disclosure Of Detailed Information About Useful Life Measured As Period Of Time Intangible Assets Other Than Goodwill [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	1 year
Computer software [member] | Top of range [member]
Disclosure Of Detailed Information About Useful Life Measured As Period Of Time Intangible Assets Other Than Goodwill [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	5 years

X

- Definition

The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_a&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of detailed information about useful life measured as period of time intangible assets other than goodwill.

+ References

No definition available.

+ Details

Name:	imtx_DisclosureOfDetailedInformationAboutUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwillLineItems
Namespace Prefix:	imtx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_LicencesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: