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IPO Related Expenses (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Disclosure Of Initial Public Offering Related Expenses [Abstract] |
Summary of Initial Public Offering Related Expenses |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
IPO related expenses |  |  | 1,794 |  |  |  | — |  |  |  | — |

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- Definition Initial public offering related expenses. + References No definition available. + Details
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