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Other Reserves (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Reserves |
Disclosure Of Other Reserves [Line Items] |
Schedule of Other Reserves |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Own share reserve |  |  | (339 | ) |  |  | (339 | ) |  |  | (339 | )
Foreign currency translation reserve |  |  | (11 | ) |  |  | (3 | ) |  |  | (1 | )
Capital reserve |  |  | 42,466 |  |  |  | — |  |  |  | — |
Share option reserve |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  | 4,406 |  |  |  | 3,291 |  |  |  | 2,506 |
Share-based payments |  |  | 11,731 |  |  |  | 1,132 |  |  |  | 785 |
Exercise of share options |  |  | (180 | ) |  |  | (17 | ) |  |  | — |
Lapse of share options |  |  | (2 | ) |  |  | — |  |  |  | — |
Balance at end of year |  |  | 15,955 |  |  |  | 4,406 |  |  |  | 3,291 |
Total other reserves |  |  | 58,071 |  |  |  | 4,064 |  |  |  | 2,951 |

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