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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues:    
Grant revenue   $ 139
Total revenues   139
Operating expenses:    
Research and development $ 1,312 2,499
General and administrative 1,381 1,384
Total operating expenses 2,693 3,883
Operating loss (2,693) (3,744)
Other income (expense):    
Foreign exchange gains (losses) (59) 180
Interest income 12 10
Other income, net 879 20
Total other income, net 832 210
Loss before taxes (1,861) (3,534)
Income tax benefit 306 493
Net loss (1,555) (3,041)
Dividend on convertible exchangeable preferred shares (50) (50)
Net loss applicable to common stockholders $ (1,605) $ (3,091)
Basic and diluted earnings per common share:    
Net loss per share - basic and diluted (in dollars per share) $ (0.38) $ (1.04)
Weighted average common shares outstanding (in shares) 4,271,324 2,965,208