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ARYA Merger - Additional Information (Detail) € in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2020 EUR (€) shares Warrants | Jun. 30, 2020 EUR (€) | Dec. 31, 2020 EUR (€) shares Warrants
Disclosure of detailed information about business combination [line items] |  |  |
Increase decrease through Changes in Noncontrolling Interest |  | € 500 |
Share listing expense |  |  | € 152,787
Increase through other contributions by owners, equity |  |  | 90,077
Share issue related cost | € 7,900 |  |
Payment for share issuance costs |  |  | 7,939
Issued capital [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Increase Decrease Through Reorganization Equity |  |  | (833)
Increase decrease through Changes in Noncontrolling Interest |  |  | 7
Increase through other contributions by owners, equity | 100 |  | 104
Share premium [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Increase Decrease Through Reorganization Equity |  |  | 833
Increase decrease through Changes in Noncontrolling Interest |  |  | 501
Increase through other contributions by owners, equity | 90,000 |  | 89,973
PIPE Financing [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Proceeds from issue of ordinary shares | 90,100 |  |
ARYA [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Increase Decrease Through Reorganization Equity | 800 |  |
Increase decrease through Changes in Noncontrolling Interest | € 500 |  |
Description Of How Acquirer Obtained Control Of Acquire | one ordinary share of Immatics N.V. for each issued and outstanding ordinary share of ARYA and one warrant to purchase ordinary shares in Immatics N.V., for each issued and outstanding warrant to acquire ordinary shares |  |
Net Assets Acquired (Liabilities Assumed) | € 90,300 |  | 90,284
Cash and cash equivalents recognised as of acquisition date | 128,800 |  |
Current liabilities recognised as of acquisition date | 3,900 |  | € 3,921
Share listing expense | 152,800 |  |
Fair value of warrant liabilities assumed in a business acquisition | € 34,600 |  |
ARYA [Member] | Warrants [Member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of instruments issued or issuable | Warrants | 7,187,500 |  | 7,187,500
ARYA [Member] | Ordinary shares [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of instruments issued or issuable | shares | 17,968,750 |  | 17,968,750

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