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Related Party Disclosures - Summary of Compensation of Key Management Personnel (Details) - GBP (£) £ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Key Management Personnel Compensation [Abstract]
Short-term employee benefits	£ 1,184	£ 1,053	£ 647
Severance payments		150
Pension and other benefits	56	47	77
Share-based payments	11,230	731	726
Key management personnel compensation	£ 12,470	£ 1,981	£ 1,450

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 24
-IssueDate 2017-01-01
-Paragraph 17
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-URIDate 2017-03-09

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X

- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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-Number 24
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-Paragraph 17
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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2017-01-01
-Paragraph 17
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X

- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2017-01-01
-Paragraph 17
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17_a&doctype=Standard
-URIDate 2017-03-09

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- Definition

Disclosure of key management personnel compensation.

+ References

No definition available.

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- Definition

The amount of compensation to key management personnel in the form of severance payments.

+ References

No definition available.

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