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CONSOLIDATED STATEMENTS OF OPERATIONS (LOSS) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenues:    
Revenues $ 420,000 $ 0
Operating expenses:    
Research and development 19,155,000 20,274,000
General and administrative 6,718,000 7,382,000
Total operating expenses 25,873,000 27,656,000
Operating loss (25,453,000) (27,656,000)
Other income (expense):    
Foreign exchange gains (losses) (414,000) 233,000
Interest income 266,000 210,000
Other income (expense), net 50,000 1,298,000
Total other income (expense), net (98,000) 1,741,000
Loss before taxes (25,551,000) (25,915,000)
Income tax benefit 2,996,000 4,717,000
Net loss (22,555,000) (21,198,000)
Dividend on convertible exchangeable preferred shares (201,000) (201,000)
Net loss applicable to common shareholders $ (22,756,000) $ (21,399,000)
Basic and diluted earnings per common share:    
Net loss per share - diluted   $ (27.24)
Redeemable common shareholders    
Other income (expense):    
Net loss applicable to common shareholders   $ (2,527,000)
Basic and diluted earnings per common share:    
Net loss per share - basic $ 0 $ (27.24)
Net loss per share - diluted $ 0.00 $ (27.24)
Common Stock    
Other income (expense):    
Net loss applicable to common shareholders $ (22,756,000) $ (18,872,000)
Basic and diluted earnings per common share:    
Net loss per share - basic $ (26.75) $ (28.70)
Net loss per share - diluted $ (26.75) $ (28.70)