Annual report pursuant to Section 13 and 15(d)

Income taxes - Change in Tax Rate (Details)

v3.22.4
Income taxes - Change in Tax Rate (Details)
12 Months Ended
Apr. 01, 2023
Dec. 31, 2023
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Dec. 31, 2022
USD ($)
Income taxes            
Increase in net deferred tax asset and corresponding valuation allowance       $ 21,481,000    
U.K.            
Income taxes            
Tax rate (as a percent) 19.00%   19.00% 19.00% 19.00%  
Difference in tax rates     25.00%      
U.K. | Forecast            
Income taxes            
Tax rate (as a percent) 25.00% 25.00%        
U.S.            
Income taxes            
Difference in tax rates     21.00% 21.00% 21.00%  
His Majesty's Revenue and Customs (HMRC)            
Income taxes            
Tax rate (as a percent)     19.00% 19.00% 19.00%  
Operating Loss Carryforwards           $ 526,784,000
Expenditure credit carryforward           $ 760,000
Annual allowance | £     £ 5,000,000      
Percentage on taxable profit           50.00%
Internal Revenue Service (IRS)            
Income taxes            
Tax credit carryforwards           $ 4,136,000
Tax credit carried forward period     20 years