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Leases - Summary of Carrying Amounts of Lease Liabilities (Detail) - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease Liabilities [Abstract]    
At January 1 £ 806 £ 434
Additions   548
Re-measurement of liability 115 2
Accretion of interest 26 21
Payments (297) (197)
Effect of foreign currency exchange differences (5) (2)
At December 31 645 806
Current 278 268
Non-current £ 367 £ 538