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Taxes (Narrative) (Details)
$ in Thousands, £ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
GBP (£)
Taxes          
Income tax credits     $ 4,700 $ 3,700  
Income tax credits - UK research and development     4,719 3,730  
Income tax benefit $ 934 $ 2,586 (4,717) (3,728)  
Valuation allowance for deferred tax assets     53,306 56,694  
Increase in valuation allowance     3,300    
Federal          
Taxes          
NOLs carryforward     3,600 2,500  
State          
Taxes          
NOLs carryforward     $ 22,100 21,100  
Operating loss carryforward, expiration date     Dec. 31, 2028    
Foreign          
Taxes          
NOLs carryforward     $ 203,000 $ 218,300  
Percentage of tax rate adopted in respect of deferred tax assets measurement     50.00%    
Annual NOL allowance restriction | £         £ 5