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Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Parenthetical) (Details) - £ / shares	12 Months Ended
	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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The exercise price of outstanding share options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 45
-Subparagraph d
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X

- 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

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