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Financial Risk Management Objectives and Policies - Summary of Currency Risk Exposure (Detail) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [2] | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Disclosure Of Currency Risk Exposure [Line Items] |  |  |  |  |
Cash and cash equivalents | € 207,530 | € 103,353 | [1] | € 39,367 | € 8,415
Financial assets | 28,198 | € 18,690 |  |  |
Currency risk [member] | Immatics GmbH [Member] |  |  |  |  |
Disclosure Of Currency Risk Exposure [Line Items] |  |  |  |  |
Cash and cash equivalents | 52,015 |  |  |  |
Financial assets | 24,448 |  |  |  |
Total assets exposed to the risk | 76,463 |  |  |  |
Immatics N.V. [Member] | Currency risk [member] |  |  |  |  |
Disclosure Of Currency Risk Exposure [Line Items] |  |  |  |  |
Cash and cash equivalents | 42,528 |  |  |  |
Financial assets | 0 |  |  |  |
Total assets exposed to the risk | € 42,528 |  |  |  |
[1] | See Note 2 for details regarding the change in presentation of Other financial assets
[2] | See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets

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