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Revenue, Collaboration (Details)	3 Months Ended
	Mar. 31, 2022 GBP (£)
Eli Lilly [Member]
Collaboration [Abstract]
Revenue recognized	£ 0

X

- Definition

The amount of revenue from performance obligations satisfied (or partially satisfied) in previous periods. [Refer: Performance obligations [member]; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 116
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_116_c&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_RevenueFromPerformanceObligationsSatisfiedOrPartiallySatisfiedInPreviousPeriods
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=imcr_EliLillyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: