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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
Total revenues $ 0 $ 0 $ 0 $ 0
Operating expenses:        
Research and development 1,182 1,222 1,980 2,534
General and administrative 1,283 1,267 2,647 2,648
Total operating expenses 2,465 2,489 4,627 5,182
Operating loss (2,465) (2,489) (4,627) (5,182)
Other income (expense):        
Foreign exchange gains (losses) (39) 16 (43) (43)
Interest income 84 18 153 30
Other income, net 66   632 879
Total other income (expense) 111 34 742 866
Loss before taxes (2,354) (2,455) (3,885) (4,316)
Income tax benefit 502 268 684 574
Net loss (1,852) (2,187) (3,201) (3,742)
Dividend on convertible exchangeable preferred shares (50) (50) (101) (100)
Net loss applicable to common shareholders $ (1,902) $ (2,237) $ (3,302) $ (3,842)
Basic and diluted earnings per common share:        
Net loss per share - basic and diluted (in dollars per share) $ (0.16) $ (0.50) $ (0.28) $ (0.88)
Weighted average common shares outstanding (in shares) 11,997,447 4,434,441 11,997,447 4,353,333