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Basis of presentation - Additional Information (Detail) - EUR (€) € in Thousands		12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2020
Disclosure of subsidiaries [line items]
Ownership interests held by non-controlling interests	5.14%
Other financial assets		€ 16,023	[1]		€ 24,448
Immatics US Inc [Member]
Disclosure of subsidiaries [line items]
Ownership interests held by non-controlling interests		3.96%		3.96%
Other financial assets		€ 16,000
[1] See Note 2 for details regarding the change in presentation of Other financial assets

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets; Current financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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- Definition

The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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