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Share Capital and Share Premium | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Classes Of Share Capital [Abstract] |
Share capital and share Premium | 11. Share capital and share premium
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Share capital |  |  | 2,047 |  |  |  | 1,299 |  |  |  | 1,289 |
Share premium |  |  | 140,890 |  |  |  | 79,541 |  |  |  | 79,426 |
|  |  | 142,937 |  |  |  | 80,840 |  |  |  | 80,715 |
|  | Number |  |  | Number |  |  | Number |
|  | (in thousands) |
Issued share capital comprises: |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares of £0.04 each |  |  | 51,175 |  |  |  | 32,479 |  |  |  | 32,226 |
|  |  | 51,175 |  |  |  | 32,479 |  |  |  | 32,226 |
|  | Number of shares |  |  | Share capital |  |  | Share premium |
|  | (in thousands) |
|  |  |  |  |  | £ |  |  | £ |
Fully paid shares: |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  |  | 32,226 |  |  |  | 1,289 |  |  |  | 79,426 |
Exercise of share options |  |  | 253 |  |  |  | 10 |  |  |  | 115 |
Balance at December 31, 2019 |  |  | 32,479 |  |  |  | 1,299 |  |  |  | 79,541 |
Exercise of share options |  |  | 33 |  |  |  | 1 |  |  |  | 14 |
Issue of share capital |  |  | 18,663 |  |  |  | 747 |  |  |  | 61,335 |
Balance at December 31, 2020 |  |  | 51,175 |  |  |  | 2,047 |  |  |  | 140,890 |
Ordinary shares Holders of ordinary shares are entitled to one vote for each share held of record on all matters submitted to a vote of shareholders and do not have cumulative voting rights. Capital management For the purpose of the Company’s capital management, capital includes issued capital, share premium and all other equity reserves attributable to the equity holders of the Company. The purpose of the Company’s capital management is to maximize shareholder value and ensure adequate capital is available to meet the medium-term operating plan. Review of operations and commitments is key to identifying future capital management and a full review is undertaken on a quarterly basis. No changes were made in the objectives, policies or processes for managing capital during the years ended December 31, 2020, 2019 or 2018.

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- Definition The entire disclosure for share capital, reserves and other equity interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 79 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79&doctype=Standard -URIDate 2020-01-01 + Details
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