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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Financial Instruments [Abstract] |
Schedule of Financial Assets Subject to Fixed or Variable Interest Rates | Financial assets subject to fixed or variable interest rates are as follows:
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
|  | Carrying amount |  |  | Carrying amount |
|  | £ |  |  | £ |
Financial assets at fixed rates |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 51,745 |  |  |  | 5,000 |
Financial assets at variable rates |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 13,708 |  |  |  | 14,433 |
Summary of Financial Assets and Liabilities in Foreign Currencies | Financial assets and liabilities in foreign currencies are as follows:
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
|  | Carrying amount |  |  | Carrying amount |
|  | £ |  |  | £ |
Financial assets |  |  |  |  |  |  |  |
Prepayments, accrued income and other receivables |  |  | 2,656 |  |  |  | 3,068 |
Current income tax receivable |  |  | 18 |  |  |  | 54 |
Cash and cash equivalents |  |  | 72,645 |  |  |  | 251 |
Financial liabilities |  |  |  |  |  |  |  |
Trade payables |  |  | 148 |  |  |  | 126 |
Payroll taxes and social security |  |  | 3 |  |  |  | — |
Accrued expenditure |  |  | 468 |  |  |  | 167 |

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- Definition The disclosure of detailed information about financial instruments. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_31&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35K -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35K&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of financial instruments by type of interest rate. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 39 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_39&doctype=Standard -URIDate 2017-03-09 + Details
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