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Financial Risk Management Objectives and Policies - Summary of Liquidity Risk (Detail) - Liquidity risk [member] - EUR (€) € in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statements [Line Items]
Financial assets held for managing liquidity risk	€ 231,978	€ 119,376
Cash And Cash Equivalents [Member]
Statements [Line Items]
Financial assets held for managing liquidity risk	207,530	103,353
Short-Term Deposits [Member]
Statements [Line Items]
Financial assets held for managing liquidity risk	€ 24,448	€ 16,023

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- Definition

The amount of financial assets held for managing liquidity risk (for example, financial assets that are readily saleable or expected to generate cash inflows to meet cash outflows on financial liabilities). [Refer: Liquidity risk [member]; Financial assets; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph B11E
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B11E&doctype=Appendix&subtype=B
-URIDate 2020-01-01

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=imtx_CashAndCashEquivalentsMember
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Balance Type:
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X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=imtx_ShorttermDepositsMember
Namespace Prefix:
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Balance Type:
Period Type: