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Share Capital and Share Premium - Summary of Share Capital and Share Premium (Details) - GBP (£) £ in Thousands | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Share capital | £ 1,272 |  | £ 663 | £ 659
Share premium | 79,236 |  | 42,770 | 42,574
Share capital and share premium | £ 80,508 |  | £ 43,433 | £ 43,233
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | 31,811,000 | 30,000 | 24,185,000 | 24,102,000
Ordinary Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | 31,811,000 |  | 6,239,000 | 6,156,000
Founder Ordinary 1 Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) |  |  | 1,000,000 | 1,000,000
Founder Ordinary 2 Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) |  |  | 1,000,000 | 1,000,000
Series A Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) |  |  | 7,483,000 | 7,483,000
Series B Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) |  |  | 8,463,000 | 8,463,000

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