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Leases - Summary of expenses related to&#160;right-of-use&#160;assets and lease liabilities (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Expenses Related ToRightOfUseAssets And Lease Liabilities [Line Items] |  |
Depreciation, right-of-use assets | € 2,195 | € 1,950
Interest expense form lease | 260 | 170
Expense relating to short-term leases for which recognition exemption has been used | 51 | 27
Buildings [member] |  |
Disclosure Of Expenses Related ToRightOfUseAssets And Lease Liabilities [Line Items] |  |
Depreciation, right-of-use assets | 2,036 | 1,804
IT and telecommunication |  |
Disclosure Of Expenses Related ToRightOfUseAssets And Lease Liabilities [Line Items] |  |
Depreciation, right-of-use assets | 101 | 101
Vehicles [member] |  |
Disclosure Of Expenses Related ToRightOfUseAssets And Lease Liabilities [Line Items] |  |
Depreciation, right-of-use assets | 50 | 37
Other assets [member] |  |
Disclosure Of Expenses Related ToRightOfUseAssets And Lease Liabilities [Line Items] |  |
Depreciation, right-of-use assets | € 8 | € 8

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | na
Period Type: | duration

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- Definition The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_c&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of expenses related to right-of-use assets and lease liabilities. + References No definition available. + Details
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- Definition Interest expense on lease. + References No definition available. + Details
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Namespace Prefix: | imtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Balance Type: |
Period Type: |

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- Details
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Period Type: |

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