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CONSOLIDATED STATEMENTS OF OPERATIONS (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenues:    
Grant revenue   $ 843
Total revenues $ 0 843
Operating expenses:    
Research and development 4,237 9,477
General and administrative 5,254 5,516
Total operating expenses 9,491 14,993
Operating loss (9,491) (14,150)
Other income (expense):    
Foreign exchange gains (losses) (39) 273
Interest income 118 37
Other income, net 949 66
Total other income (expense), net 1,028 376
Loss from continuing operations before taxes (8,463) (13,774)
Income tax benefit 993 1,983
Net loss (7,470) (11,791)
Dividend on convertible exchangeable preferred shares (201) (200)
Beneficial conversion feature of Series A convertible stock (3,638) 0
Conversion of Series A convertible preferred stock (3,537) 0
Net loss applicable to common shareholders $ (14,846) $ (11,991)
Basic and diluted earnings per common share:    
Net loss per share - basic and diluted $ (1.95) $ (3.50)
Weighted average common shares outstanding (in shares) 7,631,152 3,424,976