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CONSOLIDATED STATEMENTS OF OPERATIONS (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenues:    
Revenues $ 0 $ 0
Operating expenses:    
Research and development 20,274 15,477
General and administrative 7,382 7,461
Total operating expenses 27,656 22,938
Operating loss (27,656) (22,938)
Other income (expense):    
Foreign exchange gains (losses) 233 44
Interest income 210 16
Other income, net 1,298 144
Total other income, net 1,741 204
Loss before taxes (25,915) (22,734)
Income tax benefit 4,717 3,847
Net loss (21,198) (18,887)
Dividend on convertible exchangeable preferred shares (201) (201)
Beneficial conversion feature of Series B preferred stock 0 0
Net loss applicable to common shareholders $ (21,399) $ (19,088)
Basic and diluted earnings per common share:    
Net loss per share - basic $ (1.90) $ (2.14)
Net loss per share - diluted $ (1.90) $ (2.14)
Weighted average common shares outstanding basic 11,255,677 8,926,173
Weighted average common shares outstanding diluted 11,255,677 8,926,173