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Capital Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Capital Commitments And Contingencies [Abstract] |
Summary of Capital Commitments |
|  | 2017 |  | 2016 |
|  | (in thousands) |
|  | £ |  | £ |
Future capital expenditure contracted but not provided for |  | 147 |  |  | — |
Future Minimum Rentals Payable Under Non-cancellable Operating Leases | Future minimum rentals payable under non-cancellable operating leases are as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
|  | £ |  | £ |  |  | £ |
Not later than 1 year |  | 158 |  |  |  | 192 |  |  |  | 166 |
Later than 1 year and not later than 5 years |  | 165 |  |  |  | 62 |  |  |  | — |
Later than 5 years |  |  | — |  |  |  | — |  |  |  | — |
|  | 323 |  |  |  | 254 |  |  |  | 166 |

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- Definition The disclosure of finance leases and operating leases by the lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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