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Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Details) | 12 Months Ended
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Dec. 31, 2017 GBP (£) shares | Dec. 31, 2016 GBP (£) shares | Dec. 31, 2015 GBP (£) shares
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |  |  |
Number of shares, Outstanding, Beginning balance | shares | 3,248,187 | 2,873,747 | 2,873,747
Number of share options granted in share-based payment arrangement | shares | 1,500,815 | 507,690 | 0
Number of shares, Forfeited | shares | (7,500) |  |
Number of shares, Cancelled | shares |  | (50,000) |
Number of shares, Exercised | shares | (30,000) | (83,250) |
Number of shares, Outstanding, Ending balance | shares | 4,711,502 | 3,248,187 | 2,873,747
Number of shares, Vested and exercisable, Ending balance | shares | 4,030,833 | 2,841,419 | 2,262,500
Weighted average exercise price per share, Outstanding, Beginning balance | £ | £ 0.72 | £ 0.26 | £ 0.26
Weighted average exercise price per share, Granted | £ | 2.58 | 3.81 | 0
Weighted average exercise price per share, Forfeited | £ | 0.16 |  |
Weighted average exercise price per share, Cancelled | £ |  | 2.95 |
Weighted average exercise price per share, Exercised | £ | 4.00 | 2.40 |
Weighted average exercise price per share, Outstanding, Ending balance | £ | 1.29 | 0.72 | 0.26
Weighted average exercise price per share, Vested and exercisable, Ending balance | £ | £ 0.36 | £ 0.36 | £ 0.23

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