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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Costs and expenses:        
Research and development $ 1,747 $ 1,400 $ 3,454 $ 2,708
General and administrative 972 1,006 2,009 2,088
Total costs and expenses 2,719 2,406 5,463 4,796
Loss from operations (2,719) (2,406) (5,463) (4,796)
Interest and other income 2 2 3 4
Interest expense (2) (1) (3) (2)
Net loss and comprehensive loss $ (2,719) $ (2,405) $ (5,463) $ (4,794)
Net loss per share:        
Basic and diluted $ (0.10) $ (0.11) $ (0.22) $ (0.24)
Weighted average shares outstanding:        
Basic and diluted 27,663,269 21,009,712 24,433,342 19,903,709