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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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