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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating expenses:        
Research and development $ 1,202,725 $ 1,248,165 $ 2,191,817 $ 2,233,916
General and administrative 1,190,517 1,177,408 2,618,310 1,945,396
Total operating expenses 2,393,242 2,425,573 4,810,127 4,179,312
Loss from operations (2,393,242) (2,425,573) (4,810,127) (4,179,312)
Other income (expense):        
Change in fair value of warrant liabilities 7,500 8,237,000 4,500 5,241,000
Debt extinguishment gain 492,365 0 492,365 0
Grant income 0 231,200 0 231,200
Shares issued in debt settlement agreements 0 (70,315) 0 (70,315)
Other income 0 1,828 0 1,828
Net (loss) income $ (1,893,377) $ 5,974,140 $ (4,313,262) $ 1,224,401
Basic net (loss) income per share $ (0.22) $ 1.01 $ (0.51) $ 0.21
Diluted net (loss) income per share $ (0.22) $ 0.35 $ (0.51) $ (0.19)
Weighted average number of common shares outstanding, basic 8,576,634 5,935,000 8,503,521 5,908,917
Weighted average number of common shares outstanding, diluted 8,576,634 6,524,750 8,503,521 6,652,417