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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues:        
Total revenues     $ 0 $ 0
Operating expenses:        
Research and development $ 1,063,000 $ 1,205,000 3,227,000 3,185,000
General and administrative 1,285,000 1,250,000 3,661,000 3,898,000
Total operating expenses 2,348,000 2,455,000 6,888,000 7,083,000
Operating loss (2,348,000) (2,455,000) (6,888,000) (7,083,000)
Other income (expense):        
Foreign exchange gains (losses) 79,000 1,000 115,000 (42,000)
Interest income 42,000 85,000 177,000 238,000
Other income, net 53,000   223,000 632,000
Total other income, net 174,000 86,000 515,000 828,000
Loss before taxes (2,174,000) (2,369,000) (6,373,000) (6,255,000)
Income tax benefit 273,000 301,000 848,000 985,000
Net loss (1,901,000) (2,068,000) (5,525,000) (5,270,000)
Dividend on convertible exchangeable preferred shares (50,000) (50,000) (151,000) (151,000)
Net loss applicable to common stockholders $ (1,951,000) $ (2,118,000) $ (5,676,000) $ (5,421,000)
Basic and diluted earnings per common share:        
Net loss per share - basic and diluted (in dollars per share) $ (0.11) $ (0.18) $ (0.35) $ (0.45)
Weighted average common shares outstanding (in shares) 17,199,974 11,997,447 16,025,786 11,997,447