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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 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 -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_d&doctype=Standard -URIDate 2020-01-01 + Details
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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 -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 12 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_12_c&doctype=Standard -URIDate 2020-01-01 + Details
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