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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Costs and expenses:    
Research and development $ 2,594 $ 1,707
General and administrative 1,074 1,037
Total costs and expenses 3,668 2,744
Loss from operations (3,668) (2,744)
Interest and other income 21 1
Interest expense   (1)
Net loss (3,647) (2,744)
Change in unrealized gain on marketable securities 6  
Comprehensive loss $ (3,641) $ (2,744)
Net loss per share:    
Basic and diluted $ (0.40) $ (0.91)
Weighted average shares outstanding:    
Basic and diluted 9,053,186 3,023,932