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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating expenses:    
Research and development $ 1,007,571 $ 2,352,807
General and administrative 1,553,139 3,862,484
Depreciation 6,603 7,853
Loss from operations 2,567,313 6,223,144
Other expense:    
Interest expense, net 55,719 21
Change in fair value of warrant liabilities (Note 10) 12,919,674 0
Warrant related expenses (Note 7) 10,225,846 0
Other financing expenses 2,870,226 0
Net loss (28,638,778) (6,223,165)
Series A cumulative preferred dividends (58,845) 0
Net loss attributable to common stockholders $ (28,697,623) $ (6,223,165)
Per share information:    
Net loss per share of common stock, basic and diluted (in dollars per share) $ (2.78) $ (0.62)
Weighted average shares outstanding, basic and diluted (in shares) 10,337,726 9,996,381