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Share Capital and Share Premium - Additional Information (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 14, 2017 GBP (£) £ / shares shares | Jun. 29, 2017 GBP (£) | Dec. 31, 2017 £ / shares shares | Oct. 02, 2017 $ / shares shares | Aug. 31, 2017 shares | Dec. 31, 2016 £ / shares shares | Dec. 31, 2015 £ / shares shares
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Number of shares outstanding | shares | 24,214,641 |  |  |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | shares |  |  | 31,811,000 |  | 30,000 | 24,185,000 | 24,102,000
Description of conversion of series b shares into ordinary shares |  |  | Following the one-for-four reverse share split, for the purpose of facilitating a conversion of each Series B share (nominal value £0.004 per share), into an ordinary share (nominal value £0.04 per share), the company allotted to holders of Series B shares an additional nine Series B shares for each Series B share held. Subjected to and conditional upon this allotment, every 10 Series B shares of £0.004 were consolidated into a single Series B share of £0.04. Each Series B share of £0.04 was then automatically converted into one ordinary share of £0.04. |  |  |  |
Reserve to fund allotment of additional shares from reverse share split | £ | £ 304,650 |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Par value per share | £ 0.01 |  | £ 0.04 |  |  | £ 0.01 | £ 0.01
Par value per share after reverse share split | 0.04 |  |  |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | shares |  |  | 31,811,000 |  |  | 6,239,000 | 6,156,000
Par value per share after stock conversion | 0.04 |  |  |  |  |  |
Founder Ordinary 1 Shares |  |  |  |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Par value per share | 0.01 |  | £ 0.01 |  |  |  |
Par value per share after reverse share split | 0.04 |  |  |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | shares |  |  |  |  |  | 1,000,000 | 1,000,000
Proportion of voting rate |  |  | 5.00% |  |  |  |
Founder Ordinary 2 Shares |  |  |  |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Par value per share | 0.01 |  | £ 0.01 |  |  |  |
Par value per share after reverse share split | 0.04 |  |  |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | shares |  |  |  |  |  | 1,000,000 | 1,000,000
Proportion of voting rate |  |  | 5.00% |  |  |  |
Series A Shares |  |  |  |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Par value per share | 0.01 |  | £ 0.01 |  |  |  |
Par value per share after reverse share split | 0.04 |  |  |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | shares |  |  |  |  |  | 7,483,000 | 7,483,000
Series B Shares |  |  |  |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Par value per share | 0.001 |  | £ 0.001 |  |  |  |
Par value per share after reverse share split | 0.004 |  |  |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | shares |  |  |  |  |  | 8,463,000 | 8,463,000
Par value per share after stock conversion | £ 0.04 |  |  |  |  |  |
IPO |  |  |  |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Ordinary shares of £0.04 each (2016 and 2015: £0.01 each) | shares |  |  |  | 7,596,505,000 |  |  |
Number of share issued price per share | $ / shares |  |  |  | $ 15.00 |  |  |
Share Premium |  |  |  |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |  |  |  |
Reduction of capital by reducing share premium | £ |  | £ 42,500,000 |  |  |  |  |

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