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Related party disclosures - Additional Information (Detail) € in Millions	12 Months Ended
	Dec. 31, 2020 EUR (€) shares	Dec. 31, 2019 EUR (€) shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares
Disclosure of transactions between related parties [line items]
Accrued of key management compensation | €	€ 0.0	€ 0.7
Number of share options outstanding		103,469	74,401	31,880
ARYA [Member]
Disclosure of transactions between related parties [line items]
Number of Converted Stock Options In The Entity	417,415
Number of matching stock option in the entity	750,076
Service Options [Member] | Immatics GmbH [Member]
Disclosure of transactions between related parties [line items]
Number of share options outstanding	1,680,000
Performance Based Options [Member] | Immatics GmbH [Member]
Disclosure of transactions between related parties [line items]
Number of share options outstanding	539,000
Twenty Twenty Incentive Plan [Member] | Service Options [Member]
Disclosure of transactions between related parties [line items]
Percentage of stock vested over the period of four-year time-based vesting schedule	25.00%
Twenty Twenty Incentive Plan [Member] | Performance Based Options [Member]
Disclosure of transactions between related parties [line items]
Percentage of stock vested over the period of four-year time-based vesting schedule	25.00%
Key management personnel of entity or parent [member]
Disclosure of transactions between related parties [line items]
Payment of Payroll Tax of the employees | €	€ 3.4

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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

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The number of share options outstanding in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 45
-Subparagraph d
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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