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Share Capital and Share Premium - Summary of Share Capital and Share Premium (Detail) - GBP (£) £ in Thousands, shares in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Share capital | £ 2,047 | £ 1,299 | £ 1,289
Share premium | 140,890 | 79,541 | 79,426
Share capital and share premium | £ 142,937 | £ 80,840 | £ 80,715
Ordinary shares of £0.04 each | 51,175 | 32,479 | 32,226
Ordinary shares [member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Ordinary shares of £0.04 each | 51,175 | 32,479 | 32,226

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