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Share-based Payments - Additional Information (Details) |  |  | 12 Months Ended
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Dec. 12, 2016 GBP (£) shares | Jun. 30, 2016 | Dec. 31, 2017 GBP (£) shares yr Plan | Dec. 31, 2016 GBP (£) shares yr | Dec. 31, 2015 GBP (£) shares yr
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |
Number of equity settled share-based payment plans | Plan |  |  | 3 |  |
Description of vesting requirements for share-based payment |  |  | 1) options granted to a director, under which a third of the options granted vested immediately with the remaining two-thirds vesting each subsequent year; and 2) options granted to three employees, under which two thirds of the options vested immediately with the remaining third vesting in 2017. |  |
Number of share options granted in share-based payment arrangement | shares |  |  | 1,500,815 | 507,690 | 0
Weighted average remaining contractual life of outstanding share options | yr |  |  | 4.49 | 6.66 | 6.18
Employee remuneration expense, related to equity-settled share-based payments | £ |  |  | £ 11,700,000 | £ 1,100,000 | £ 800,000
U.K. Share-based Payment Plans |  |  |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |
Share options granted, vesting period |  |  | 4 years | 4 years |
Stock Option Plan (U.S. Sub-Plan) |  |  |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |
Share options granted, vesting period |  | 4 years | 4 years |  |
Number of share options granted in share-based payment arrangement | shares | 45,750 |  |  |  |
Share options exercise price per share | £ | £ 4.00 |  |  |  |
Share option exercised date | Dec. 29, 2016 |  |  |  |
Stock Option Plan (U.S. Sub-Plan) | Maximum |  |  |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |
Term of share options exercised | 6 months |  |  |  |
2016 Share Options |  |  |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |
Discount rate used to compute present value |  |  |  | 25.00% |
2017 Share Options |  |  |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |
Discount rate used to compute present value |  |  | 25.00% |  |

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- Definition The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_a&doctype=Standard -URIDate 2017-03-09 + Details
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