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Revenue, Deferred revenue (Details) - GBP (£)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Deferred revenue [Abstract]
Revenue recognized	£ 1,602,000		£ 3,204,000
Revenue recognised related to performance obligations	0	£ 0	0	£ 0
Aggregate non-refundable fee payment	£ 4,331,000		£ 4,331,000		£ 4,331,000

X

- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate amount of the entity's considered to be non refundable.

+ References

No definition available.

+ Details

Name:	imcr_AggregateNonRefundablePayment
Namespace Prefix:	imcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of revenue recognized that was previously reported as deferred revenue.

+ References

No definition available.

+ Details

Name:	imcr_DeferredRevenuesRevenueRecognized
Namespace Prefix:	imcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of revenue recognized related to performance obligations.

+ References

No definition available.

+ Details

Name:	imcr_RevenueRecognizedRelatedToPerformanceObligations
Namespace Prefix:	imcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration