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Non-current interest-bearing loans and borrowings, Loan and security agreement (Details) £ in Thousands, $ in Millions	Dec. 31, 2020 GBP (£)	Nov. 06, 2020 USD ($) Tranche	Dec. 31, 2019 GBP (£)
Interest-bearing loans and borrowings [Abstract]
Borrowings outstanding | £	£ 36,654		£ 0
Oxford Finance Agreement [Member]
Interest-bearing loans and borrowings [Abstract]
Borrowings, maximum capacity		$ 100
Number of tranches | Tranche		3
Oxford Finance Agreement, Tranche One [Member]
Interest-bearing loans and borrowings [Abstract]
Borrowings outstanding		$ 50
Oxford Finance Agreement, Tranche Two [Member]
Interest-bearing loans and borrowings [Abstract]
Borrowings outstanding		25
Oxford Finance Agreement, Tranche Three [Member]
Interest-bearing loans and borrowings [Abstract]
Borrowings, remaining amount		$ 25

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Remaining borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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

X

- Definition

The amount maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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

X

- Definition

The number of tranches the amount being agreed to lend to Group.

+ References

No definition available.

+ Details

Name:	imcr_NumberOfTranches
Namespace Prefix:	imcr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=imcr_OxfordFinanceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=imcr_OxfordFinanceAgreementTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=imcr_OxfordFinanceAgreementTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=imcr_OxfordFinanceAgreementTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: