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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenues:        
Total revenues $ 0 $ 0 $ 0 $ 0
Operating expenses:        
Research and development 1,153 1,182 2,165 1,980
General and administrative 1,184 1,283 2,376 2,647
Total operating expenses 2,337 2,465 4,541 4,627
Operating loss (2,337) (2,465) (4,541) (4,627)
Other income (expense):        
Foreign exchange gains (losses) 21 (39) 36 (43)
Interest income 56 84 135 153
Other income, net 170 66 170 632
Total other income (expense), net 247 111 341 742
Loss before taxes (2,090) (2,354) (4,200) (3,885)
Income tax benefit 307 502 575 684
Net loss (1,783) (1,852) (3,625) (3,201)
Dividend on convertible exchangeable preferred shares (50) (50) (101) (101)
Net loss applicable to common shareholders $ (1,833) $ (1,902) $ (3,726) $ (3,302)
Basic and diluted earnings per common share:        
Net loss per share - basic and diluted (in dollars per share) $ (0.11) $ (0.16) $ (0.24) $ (0.28)
Weighted average common shares outstanding (in shares) 17,199,974 11,997,447 15,428,962 11,997,447