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v3.23.2

Share capital (Details) | 6 Months Ended
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Jun. 30, 2023 shares
Ordinary Shares [Member] |
Issued and Fully Paid Share Capital [Abstract] |
Number of shares outstanding at beginning of period (in shares) | 48,088,346
Exercise of share options (in shares) | 853,003
Number of shares outstanding at end of period (in shares) | 48,941,349
Deferred Shares [Member] |
Issued and Fully Paid Share Capital [Abstract] |
Number of shares outstanding at beginning of period (in shares) | 5,793,501
Exercise of share options (in shares) | 0
Number of shares outstanding at end of period (in shares) | 5,793,501

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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The increase (decrease) in number of shares through exercise of share options. + References No definition available. + Details
Name: | imcr_IncreaseDecreaseThroughExerciseOfShareOptions
Namespace Prefix: | imcr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | imcr_IssuedAndFullyPaidShareCapitalAbstract
Namespace Prefix: | imcr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=imcr_DeferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |