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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating expenses:    
Research and development $ 1,825,568 $ 1,007,571
General and administrative 1,497,839 1,553,139
Depreciation 28,018 6,603
Loss from operations 3,351,425 2,567,313
Other expense:    
Interest (income) expense, net (37,464) 55,719
Change in fair value of warrant liabilities 12,919,674
Warrant related expenses 10,225,846
Other financing expenses 2,870,226
Net loss (3,313,961) (28,638,778)
Series A cumulative preferred dividends (85,993) (58,845)
Deemed dividend related to the make-whole provision for the conversion of Series A preferred stock into common stock (8,167,895)
Net loss attributable to common stockholders $ (11,567,849) $ (28,697,623)
Per share information:    
Net loss per share of common stock, basic and diluted (in dollars per share) $ (0.27) $ (2.78)
Weighted average shares outstanding, basic and diluted (in shares) 42,122,395 10,337,726