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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Costs and expenses:        
Research and development $ 1,716 $ 1,335 $ 5,170 $ 4,043
General and administrative 1,101 950 3,110 3,038
Total costs and expenses 2,817 2,285 8,280 7,081
Loss from operations (2,817) (2,285) (8,280) (7,081)
Interest and other income 4 2 7 6
Interest expense (1) (1) (4) (3)
Net loss and comprehensive loss $ (2,814) $ (2,284) $ (8,277) $ (7,078)
Net loss per share:        
Basic and diluted $ (0.31) $ (0.76) $ (1.54) $ (2.44)
Weighted average shares outstanding:        
Basic and diluted 9,034,016 3,004,163 5,358,629 2,897,568