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Share Capital and Share Premium - Summary of Movement in the Share Capital (Detail) £ in Thousands | 12 Months Ended
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Dec. 31, 2020 GBP (£) shares | Dec. 31, 2019 GBP (£) shares | Dec. 31, 2018 GBP (£) shares
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Beginning balance | £ 63,522 | £ 81,594 | £ 93,420
Beginning balance, Shares | shares | 32,479,000 | 32,226,000 |
Exercise of share options | £ 15 | £ 125 | £ 207
Exercise of share options | shares | 32,500 | 252,187 | 415,312
Issue of share capital, Shares | shares | 18,663,000 |  |
Ending balance | £ 99,230 | £ 63,522 | £ 81,594
Ending balance, Shares | shares | 51,175,000 | 32,479,000 | 32,226,000
Share Capital [member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Beginning balance | £ 1,299 | £ 1,289 | £ 1,272
Exercise of share options | 1 | 10 | 17
Issue of share capital | 747 |  |
Ending balance | 2,047 | 1,299 | 1,289
Share Premium [member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Beginning balance | 79,541 | 79,426 | 79,236
Exercise of share options | 14 | 115 | 190
Issue of share capital | 61,335 |  |
Ending balance | £ 140,890 | £ 79,541 | £ 79,426

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