v3.26.1
INCOME TAXES - Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Amount    
U.S. federal statutory tax rate $ (2,212)  
State and local income taxes, net of federal income tax effect $ 1  
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration] CALIFORNIA  
Statutory tax rate difference between United Kingdom and the United States $ (326)  
Nondeductible research expense 723  
Nontaxable or nondeductible items    
Stock compensation 109  
Other 1  
Total $ (24) $ 1
Tax Jurisdiction of Domicile [Extensible Enumeration] UNITED STATES  
Reconciliation of the statutory income tax rate to effective tax rate    
Taxes at domestic rate 21.00% 21.00%
State and local income taxes 0.00% 0.00%
Non-US statutory rates 3.10% 3.50%
Change in valuation allowance   (17.20%)
Nondeductible Research Expense (6.90%) (6.10%)
Other   0.20%
Statutory Rate Change 0.00%  
Effect of cross-border tax laws 0.00%  
Tax credits 0.00%  
Nontaxable or nondeductible items    
Stock compensation (1.00%)  
Other  
Changes in unrecognized tax benefits 0.00%  
Effective tax rate 0.20% 0.40%
UNITED STATES    
Amount    
Changes in valuation allowances $ 364  
Other adjustments $ 7  
Reconciliation of the statutory income tax rate to effective tax rate    
Change in valuation allowance (3.50%)  
Other (0.10%)  
United Kingdom    
Amount    
Changes in valuation allowances $ 1,362  
Other adjustments $ (54)  
Reconciliation of the statutory income tax rate to effective tax rate    
Change in valuation allowance (12.90%)  
Other 0.50%