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Income Tax - Additional Information (Detail) - EUR (€) € in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Statements [Line Items] |  |  |  |  |
statutory tax rate | 28.50% | 28.50% | 28.50% | 28.50% |
Corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00% |
Current tax liability | € 1,145 |  | € 1,145 |  | € 0
GERMANY | Immatics Biotechnologies GmbH [Member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Current tax liability | € 1,200 |  | € 1,200 |  |
Percentage of income that can be used to set off tax losses carry forward | 60.00% |  |  |  |
Percentage of pretax income subject to income tax | 40.00% |  |  |  |

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