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Accounts receivable (Tables) | 12 Months Ended
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Dec. 31, 2020
Text Block [Abstract] |
Summary of Trade receivables |
|  | As of |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | (Euros in thousands) |
Receivables from collaboration agreements |  |  | 1,250 |  |  |  | 957 |
Accounts receivable |  |  | 1,250 |  |  |  | 957 |

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Namespace Prefix: | imtx_
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Balance Type: | na
Period Type: | duration

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- Definition Text block. + References No definition available. + Details
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Namespace Prefix: | imtx_
Data Type: | xbrli:stringItemType
Balance Type: | na
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