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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues:        
Grant revenue   $ 222   $ 361
Operating expenses:        
Research and development $ 1,222 2,637 $ 2,534 5,136
General and administrative 1,267 1,345 2,648 2,729
Total operating expenses 2,489 3,982 5,182 7,865
Operating loss (2,489) (3,760) (5,182) (7,504)
Other income (expense):        
Foreign exchange gains (losses) 16 138 (43) 318
Interest income 18 13 30 23
Other income, net   18 879 38
Total other income (expense) 34 169 866 379
Loss before taxes (2,455) (3,591) (4,316) (7,125)
Income tax benefit 268 626 574 1,119
Net loss (2,187) (2,965) (3,742) (6,006)
Dividend on convertible exchangeable preferred shares (50) (50) (100) (100)
Net loss applicable to common shareholders $ (2,237) $ (3,015) $ (3,842) $ (6,106)
Basic and diluted earnings per common share:        
Net loss per share - basic and diluted $ (0.50) $ (1.01) $ (0.88) $ (2.05)
Weighted average common shares outstanding 4,434,441 3,000,192 4,353,333 2,982,508