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Other Reserves - Schedule of Other Reserves (Detail) - GBP (£) £ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share option reserve |  |  |
Total other reserves | £ 66,887 | £ 62,737 |
Other Reserves |  |  |
Disclosure Of Other Reserves [Line Items] |  |  |
Own share reserve | (339) | (339) | £ (339)
Foreign currency translation reserve | (22) | (10) | 1
Capital reserve | 42,466 | 42,466 | 42,466
Share option reserve |  |  |
Balance at beginning of year | 20,620 | 17,564 | 15,955
Share-based payments | 4,823 | 3,289 | 1,977
Exercise of share options | (68) | (132) | (186)
Forfeiture of share options | (518) | (63) | (182)
Lapse of share options | (75) | (38) |
Balance at end of year | 24,782 | 20,620 | 17,564
Total other reserves | £ 66,887 | £ 62,737 | £ 59,692

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- Definition A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition A component of equity resulting from discretionary participation features. Discretionary participation features are contractual rights to receive, as a supplement to guaranteed benefits, additional benefits: (a) that are likely to be a significant portion of the total contractual benefits; (b) whose amount or timing is contractually at the discretion of the issuer; and (c) that are contractually based on: (i) the performance of a specified pool of contracts or a specified type of contract; (ii) realised and/or unrealised investment returns on a specified pool of assets held by the issuer; or (iii) the profit or loss of the company, fund or other entity that issues the contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph IG22 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_IG22_f&doctype=Implementation%20Guidance&book=b -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 34 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_34_b&doctype=Standard&book=b -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-b&anchor=para_78_e&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition A component of equity representing exchange differences on translation of financial statements of foreign operations recognised in other comprehensive income and accumulated in equity. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2020-01-01 -Paragraph 52 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2020-en-r&anchor=para_52_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Lapse of share options reserve. + References No definition available. + Details
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- Definition Reserve of share based payment. + References No definition available. + Details
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- Definition Reserve of share options exercised. + References No definition available. + Details
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- Definition Share option reserve [abstract]. + References No definition available. + Details
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- Details
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