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Significant accounting policies, Segmental reporting (Details) | 6 Months Ended
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Jun. 30, 2023 Segment
Segment reporting [Abstract] |
Number of operating segment | 1

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

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- Definition Number of operating segments of an entity. + References No definition available. + Details
Name: | imcr_NumberOfOperatingSegment
Namespace Prefix: | imcr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration