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CONSOLIDATED STATEMENTS OF OPERATIONS (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenues:    
Total revenues   $ 150
Operating expenses:    
Research and development $ 4,658 4,327
General and administrative 5,024 5,371
Total operating expenses 9,682 9,698
Operating loss (9,682) (9,548)
Other income (expense):    
Foreign exchange gains (losses) 101 (90)
Interest income 224 331
Other income, net 231 682
Total other income, net 556 923
Loss before taxes (9,126) (8,625)
Income tax benefit 1,296 1,337
Net loss (7,830) (7,288)
Dividend on convertible exchangeable preferred shares (201) (201)
Net loss applicable to common stockholders $ (8,031) $ (7,489)
Basic and diluted earnings per common share:    
Net loss per share - basic and diluted (in dollars per share) $ (0.49) $ (0.62)
Weighted-average number of common shares used in loss per share – basic and diluted 16,321,746 12,094,131
Collaboration and research and development revenue [Member]    
Revenues:    
Total revenues   $ 150