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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenues:        
Revenues $ 0 $ 0 $ 0 $ 0
Operating expenses:        
Research and development 4,205 4,101 9,159 6,667
General and administrative 1,580 1,999 3,185 3,738
Total operating expenses 5,785 6,100 12,344 10,405
Operating loss (5,785) (6,100) (12,344) (10,405)
Other income (expense):        
Foreign exchange gains (losses) 209 (13) 238 (3)
Interest income 17 4 21 8
Other income, net   18 1,280 144
Total other income, net 226 9 1,539 149
Loss before taxes (5,559) (6,091) (10,805) (10,256)
Income tax benefit 984 964 2,122 1,651
Net loss (4,575) (5,127) (8,683) (8,605)
Dividend on convertible exchangeable preferred shares (50) (50) (101) (101)
Net loss applicable to common shareholders $ (4,625) $ (5,177) $ (8,784) $ (8,706)
Basic and diluted earnings per common share:        
Net loss per share - basic $ (0.46) $ (0.56) $ (0.87) $ (1.07)
Net loss per share - diluted $ (0.46) $ (0.56) $ (0.87) $ (1.07)
Weighted average common shares outstanding basic 10,136,089 9,234,110 10,065,007 8,172,472
Weighted average common shares outstanding diluted 10,136,089 9,234,110 10,065,007 8,172,472