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Income Tax - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Income Tax [Line Items]    
Deferred tax asset $ 54,400,000 $ 31,489,000
Increase in valuation allowance 22,517,000  
Increase in net deferred tax assets due to change in enacted tax rate 9,311,000  
Increase in valuation allowance due to change in enacted tax rate 9,311,000  
Research and development tax relief 15,206,000 9,363,000
Liability for unrecognized tax benefits 0 0
Liability for interest and penalties 0 0
Research and development tax credit carryforwards    
Schedule Of Income Tax [Line Items]    
Tax credit carryforward 941,000  
U.S. Federal    
Schedule Of Income Tax [Line Items]    
Operating loss carryforwards 1,034,000 $ 232,000
U.S. State    
Schedule Of Income Tax [Line Items]    
Operating loss carryforwards 165,000  
U.K.    
Schedule Of Income Tax [Line Items]    
Operating loss carryforwards 191,714,000  
Potential deferred tax asset $ 47,929,000