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Income Tax - Additional Information (Detail) - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Statements [Line Items]
statutory tax rate	28.50%	28.50%	28.50%	28.50%
Corporate income tax rate	21.00%	21.00%	21.00%	21.00%
Current tax liability	€ 1,145		€ 1,145		€ 0
GERMANY | Immatics Biotechnologies GmbH [Member]
Statements [Line Items]
Current tax liability	€ 1,200		€ 1,200
Percentage of income that can be used to set off tax losses carry forward	60.00%
Percentage of pretax income subject to income tax	40.00%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
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-URIDate 2021-03-24

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- Definition

The amount of current tax for current and prior periods to the extent unpaid. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

corporate income tax rate.

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- Definition

Percentage of income that can be used to set off tax losses carry forward.

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- Definition

Percentage of pretax income subject to income tax.

+ References

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