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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues:        
Grant revenue   $ 205   $ 566
Operating expenses:        
Research and development $ 958 2,409 $ 3,491 7,545
General and administrative 1,154 1,273 3,802 4,002
Total operating expenses 2,112 3,682 7,293 11,547
Operating loss (2,112) (3,477) (7,293) (10,981)
Other income (expense):        
Foreign exchange gains (losses) (22) 51 (65) 369
Interest income 30 8 59 31
Other income, net 28 18 907 56
Total other income 36 77 901 456
Loss before taxes (2,076) (3,400) (6,392) (10,525)
Income tax benefit 219 454 793 1,573
Net loss (1,857) (2,946) (5,599) (8,952)
Dividend on convertible exchangeable preferred shares (50) (50) (151) (150)
Beneficial conversion feature of Series A convertible preferred stock (3,638)   (3,638)  
Conversion of Series A convertible preferred stock (3,373)   (3,373)  
Net loss applicable to common shareholders $ (8,918) $ (2,996) $ (12,761) $ (9,102)
Basic and diluted earnings per common share:        
Net loss per share - basic and diluted (in dollars per share) $ (0.91) $ (0.86) $ (2.06) $ (2.89)
Weighted average common shares outstanding (in shares) 9,835,441 3,473,696 6,200,783 3,145,730