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Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Parenthetical) (Details) - £ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Weighted average share price for share options at date of exercise | £ 4.63 | £ 7.65 | £ 18.23
Bottom Of Range [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Exercise price of outstanding share options | 0.04 |  |
Maximum [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Exercise price of outstanding share options | £ 18.05 |  |

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- Definition The weighted average share price at the date of exercise for share options that are exercised in a share-based payment arrangement. [Refer: Share-based payment arrangements [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_c&doctype=Standard -URIDate 2020-01-01 + Details
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