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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)
£ in Thousands
 6 Months Ended
Jun. 30, 2022
GBP (£)
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance £ 2,530
Ending balance 2,114
Cost or valuation [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 4,108
Additions 10
Currency translation effects 10
Ending balance 4,128
Depreciation/Amortization and impairment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance (1,578)
Impairment (18)
Depreciation for the period (418)
Ending balance (2,014)
Leasehold improvements [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 433
Ending balance 386
Leasehold improvements [member] | Cost or valuation [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 557
Additions 0
Currency translation effects 0
Ending balance 557
Leasehold improvements [member] | Depreciation/Amortization and impairment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance (124)
Impairment 0
Depreciation for the period (47)
Ending balance (171)
Office equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 104
Ending balance 100
Office equipment [member] | Cost or valuation [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 173
Additions 7
Currency translation effects 0
Ending balance 180
Office equipment [member] | Depreciation/Amortization and impairment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance (69)
Impairment 0
Depreciation for the period (11)
Ending balance (80)
IT equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 51
Ending balance 44
IT equipment [member] | Cost or valuation [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 180
Additions 3
Currency translation effects 0
Ending balance 183
IT equipment [member] | Depreciation/Amortization and impairment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance (129)
Impairment 0
Depreciation for the period (10)
Ending balance (139)
Right-of-use asset (building) [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 1,878
Ending balance 1,555
Right-of-use asset (building) [member] | Cost or valuation [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 2,903
Additions 0
Currency translation effects 4
Ending balance 2,907
Right-of-use asset (building) [member] | Depreciation/Amortization and impairment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance (1,025)
Impairment (18)
Depreciation for the period (309)
Ending balance (1,352)
Right-of-use asset (equipment) [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 64
Ending balance 29
Right-of-use asset (equipment) [member] | Cost or valuation [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance 295
Additions 0
Currency translation effects 6
Ending balance 301
Right-of-use asset (equipment) [member] | Depreciation/Amortization and impairment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning balance (231)
Impairment 0
Depreciation for the period (41)
Ending balance £ (272)