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Revenue from collaboration agreements - Additional Information (Detail) - EUR (€) € in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |
Amortization of contract costs capitalized | € 200 | € 100 | € 300 | € 100
Revenue from collaboration agreement of right to use license | 17,215 | 5,189 | 120,123 | 12,592
BMS Collaboration Agreement [Member] |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |
Revenue from collaboration agreement of right to use license | 12,107 | € 1,297 | 110,532 | € 4,590
Revenue from collaboration agreements |  |  | 19,200 |
BMS Collaboration Agreement [Member] | IMA401 [Member] |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |
Revenue from collaboration agreement of right to use license |  |  | 91,300 |
Collaboration Agreement [Member] |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |
Milestone or royalty payment receivable | € 0 |  | € 0 |

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- Definition The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 128 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_128_b&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_113_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_114&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | credit
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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Milestone or royalty payment receivable. + References No definition available. + Details
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Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Revenue from collaboration agreements + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |