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Other Reserves | 12 Months Ended
--- | ---
Dec. 31, 2017
Disclosure Of Other Reserves [Abstract] |
Other reserves | 12. Other reserves
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Own share reserve |  |  | (339 | ) |  |  | (339 | ) |  |  | (339 | )
Foreign currency translation reserve |  |  | (11 | ) |  |  | (3 | ) |  |  | (1 | )
Capital reserve |  |  | 42,466 |  |  |  | — |  |  |  | — |
Share option reserve |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  | 4,406 |  |  |  | 3,291 |  |  |  | 2,506 |
Share-based payments |  |  | 11,731 |  |  |  | 1,132 |  |  |  | 785 |
Exercise of share options |  |  | (180 | ) |  |  | (17 | ) |  |  | — |
Lapse of share options |  |  | (2 | ) |  |  | — |  |  |  | — |
Balance at end of year |  |  | 15,955 |  |  |  | 4,406 |  |  |  | 3,291 |
Total other reserves |  |  | 58,071 |  |  |  | 4,064 |  |  |  | 2,951 |
Foreign currency translation reserve The foreign currency translation reserve is used to record exchange differences arising from the translation of the financial statements of foreign operations. Own share reserve The own share reserve represents the cost of 500,000 shares of NuCana plc purchased by NuCana Employee Benefit Trust and that may, at the discretion of the trustee, be used to satisfy future exercise of options under the Company’s share options plan. Capital reserve The capital reserve balance arose from the reduction of our share premium account and corresponding increase to our capital reserve account reflected as of June 30, 2017 in connection with our re-registration as a public limited company, as further described in Note 1. Share option reserve The share option reserve is used to recognize the value of equity-settled share-based payments provided to employees, directors and consultants as part of their remuneration. Refer to Note 13 for further details of these plans.

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- Definition The entire disclosure for other reserves. + References No definition available. + Details
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