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Shareholders' equity (deficit) - Additional Information (Detail) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 EUR (€) | Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2020 $ / shares | Jul. 01, 2020 EUR (€) € / shares shares | Dec. 31, 2019 EUR (€) € / shares shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 EUR (€)
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Stock issued during period, value, new issues | € | € 500,000 | € 0.01 |  |  |  |  |  |
Number of shares outstanding | shares |  | 62,908,617 |  |  |  |  |  |
Par value per share | € / shares |  | € 0.01 |  |  |  |  |  |
Number of shares value outstanding | € |  | € 629,000 |  | € 629,000 | € 1,164,000 | [1] |  |
Share premium | € |  | € 573,339,000 |  |  | € 190,945,000 | [1] |  |
Reorganization [Member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares outstanding | shares |  |  |  |  | 33,093,838 |  |  |
Par value per share | $ / shares |  |  |  |  |  |  | $ 0.01 |
ARYA Merger [Member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of warrants outsatnding | shares |  | 7,187,500 |  |  |  |  |  |
Exercise price per share | $ / shares |  |  | $ 11.50 |  |  |  |  |
Class of warrant or right, term period |  | 5 years |  |  |  |  |  |
Immatics Biotechnologies GmbH [Member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares outstanding | shares |  |  |  |  | 1,163,625 |  |  |
Par value per share | € / shares |  |  |  |  | € 1.00 |  |  |
PIPE Financing [member] | ARYA Merger [Member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Share premium | € |  |  |  | € 3,625,000,000 |  |  |  |
Ordinary Shares [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares outstanding | shares |  |  |  | 62,908,617 |  |  |  |
Par value per share | € / shares |  |  |  | € 0.01 |  |  |  |
Series E Share Capital [member] | Immatics Biotechnologies GmbH [Member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Share premium | € |  |  |  |  |  |  |  | € 23,600,000
[1] | See Note 2 for details regarding the change in presentation of Other financial assets

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