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Share Capital and Share Premium (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Classes Of Share Capital [Abstract] |
Summary of 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 |
Summary of Movement in the Share Capital |
|  | 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 |

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- Definition The disclosure of classes of share capital. [Refer: Share capital [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a&doctype=Standard -URIDate 2020-01-01 + Details
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