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Condensed 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
Income Statement [Abstract]        
License Revenue $ 7 $ 10 $ 21 $ 21
Operating Expenses:        
Research and development 3,533 2,088 11,939 5,263
General and administrative 1,373 1,490 3,549 2,618
Total operating expenses 4,906 3,578 15,488 7,881
Loss from Operations (4,899) (3,568) (15,467) (7,860)
Other Income (expense):        
Interest income 2 1 4 2
Interest expense (95) (357) (1,100) (520)
Loss on extinguishment of convertible promissory notes     (3,177)  
Other income (expense), net 1 (71) 553 (267)
Net Loss and Comprehensive Loss $ (4,991) $ (3,995) $ (19,187) $ (8,645)
Net loss per share to common stockholders, basic and diluted $ (0.19) $ (5.89) $ (1.12) $ (14.75)
Weighted average common shares outstanding, basic and diluted 26,322,494 678,189 17,203,279 586,111