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Share capital (Details)	6 Months Ended
	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

X

- 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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The increase (decrease) in number of shares through exercise of share options.

+ References

No definition available.

+ Details

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Namespace Prefix:	imcr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	imcr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: