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Summary of Significant Accounting Policies (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2023
Dec. 31, 2024
USD ($)
segment
county
Dec. 31, 2023
USD ($)
Dec. 31, 2024
GBP (£)
county
Summary of Significant Accounting Policies        
Cash and cash equivalents   $ 3,137,000 $ 3,378,000  
Cash exceeding balance insured by FDIC   $ 2,800,000    
Cash balance insured by FSCS | £       £ 85,000
Number of operating segments | segment   1    
Number of reportable segments | segment   1    
Number of geographic areas for development operations | county   2   2
Revenues   $ 43,000 420,000  
Stock awards vesting period 3 years      
Reclassifications out of other comprehensive income (loss)   0 $ 0  
Revenue, Remaining performance obligation   $ 0    
Minimum        
Summary of Significant Accounting Policies        
Stock awards vesting period   3 years    
Minimum | Property and equipment        
Summary of Significant Accounting Policies        
Estimated useful life   3 years   3 years
Maximum        
Summary of Significant Accounting Policies        
Cash balances insured by FDIC   $ 250,000    
Stock awards vesting period   4 years    
Maximum | Property and equipment        
Summary of Significant Accounting Policies        
Estimated useful life   5 years   5 years
Board of Directors        
Summary of Significant Accounting Policies        
Stock awards vesting period   1 year