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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenues:    
Grant revenue $ 139 $ 512
Total revenues 139 512
Operating expenses:    
Research and development 2,499 4,342
General and administrative 1,384 1,468
Total operating expenses 3,883 5,810
Operating loss (3,744) (5,298)
Other income (expense):    
Change in valuation of financial instruments associated with stock purchase agreement   (20)
Foreign exchange gains (losses) 180 (378)
Interest income 10 1
Other income, net 20 20
Total other income (expense) 210 (377)
Loss before taxes (3,534) (5,675)
Income tax benefit 493 763
Net loss (3,041) (4,912)
Dividend on convertible exchangeable preferred shares (50) (50)
Net loss applicable to common stockholders $ (3,091) $ (4,962)
Basic and diluted earnings per common share:    
Net loss per share - basic and diluted (in dollars per share) $ (0.09) $ (0.19)
Weighted average common shares outstanding (in shares) 35,582,492 26,067,078