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Share Capital and Share Premium - Summary of Share Capital and Share Premium (Parenthetical) (Details) - £ / shares | Dec. 31, 2017 | Sep. 14, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Ordinary Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Par value per share | £ 0.04 | £ 0.01 | £ 0.01 | £ 0.01
Founder Ordinary 1 Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Par value per share | 0.01 | 0.01 |  |
Founder Ordinary 2 Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Par value per share | 0.01 | 0.01 |  |
Series A Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Par value per share | 0.01 | 0.01 |  |
Series B Shares |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Par value per share | £ 0.001 | £ 0.001 |  |

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