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Condensed Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Operating costs and expenses:        
Research and development $ 2,348,755 $ 1,505,116 $ 7,112,177 $ 1,584,086
Patent costs 98,908 47,611 199,888 160,033
General and administrative 1,091,647 1,555,938 3,533,608 4,860,676
Total operating costs and expenses 3,539,310 3,108,665 10,845,673 6,604,795
Operating loss (3,539,310) (3,108,665) (10,845,673) (6,604,795)
Other income:        
Interest income 13,239 18,853 50,466 23,157
Other income 9,590 1,214 16,682
Total other income 13,239 28,443 51,680 39,839
Net loss (3,526,071) (3,080,222) (10,793,993) (6,564,956)
Cumulative preferred stock dividends (327,569)
Accretion of discount on Series C preferred stock (63,283)
Net loss applicable to common shareholders $ (3,526,071) $ (3,080,222) $ (10,793,993) $ (6,955,808)
Net loss per common share - basic and diluted $ (0.41) $ (0.40) $ (1.26) $ (2.35)
Weighted-average common shares outstanding - basic and diluted 8,585,406 7,792,050 8,584,442 2,961,263