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Leases - Additional information (Detail) £ in Thousands | 12 Months Ended
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Dec. 31, 2020 GBP (£) LeaseContract | Dec. 31, 2019 GBP (£)
Presentation Of Leases For Lessee [Abstract] |  |
Information about nature of lessee's leasing activities | lease terms of between two and five years |
Total net cash outflows for leases | £ 300 | £ 200
Non-cash additions to right-of-use assets and lease liabilities | 0 | 500
Re-measurement of right of use asset and lease liability | £ 115 | £ 2
Information about lessee's exposure arising from variable lease payments | The Company has one lease contract with variable payments where the lease costs after the first year of the lease are increased based upon a consumer price index. |
Number of lease contracts with variable lease payments | LeaseContract | 1 |
Information about lessee's exposure arising from extension options and termination options | The Company has a number of lease contracts that include extension and termination options. These options are negotiated by management to provide flexibility in managing the leased asset portfolio and align it with the Company’s business needs. None of the termination options have been exercised or are expected to be exercised. |

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_g&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Information about the lessee's exposure arising from extension options and termination options. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 59 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_59_b_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Information about the lessee's exposure arising from variable lease payments. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 59 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_59_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Information about the nature of the lessee's leasing activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 59 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_59_a&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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- Definition Non-cash additions to right of use assets and lease liabilities. + References No definition available. + Details
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- Definition Number of lease contracts with variable lease payments. + References No definition available. + Details
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