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Condensed Statements of Comprehensive Loss - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating expenses:        
General and administrative $ 1,250,000 $ 2,364,000 $ 3,772,000 $ 7,025,000
Research and development 1,068,000 3,542,000 3,695,000 12,479,000
Total operating expenses 2,318,000 5,906,000 7,467,000 19,504,000
Loss from operations (2,318,000) (5,906,000) (7,467,000) (19,504,000)
Interest income (expense), net 4,000 (172,000) (816,000) (476,000)
Other expense, net (1,116,000) (1,000) (1,868,000) (1,000)
Loss before income taxes (3,430,000) (6,079,000) (10,151,000) (19,981,000)
Provision (benefit) for income taxes 0 0 0 0
Net loss (3,430,000) (6,079,000) (10,151,000) (19,981,000)
Other comprehensive loss, net of tax 0 0 0 0
Comprehensive loss $ (3,430,000) $ (6,079,000) $ (10,151,000) $ (19,981,000)
Net loss per share:        
Basic and diluted (Note 10) $ (0.24) $ (0.43) $ (0.71) $ (1.46)
Number of shares used in per share calculations:        
Basic and diluted 14,265,411 14,259,691 14,265,411 13,650,556