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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating expenses:        
Research and development $ 1,169,810 $ 1,759,305 $ 4,386,491 $ 3,946,420
General and administrative 1,589,621 1,559,399 4,748,090 4,908,424
Goodwill impairment 4,186,050 4,186,050
Depreciation 26,723 27,374 81,450 39,767
Loss from operations 6,972,204 3,346,078 13,402,081 8,894,611
Other expense (income):        
Interest (income) expense, net (37,981) (1,318) (120,784) 73,290
Change in fair value of warrant liability (8,441,616) (18,909,792)
Warrant related expenses 10,225,846
Other financing expenses 2,870,226
(Loss) income from operations before income tax benefit (6,934,223) 5,096,856 (13,281,297) (3,154,181)
Income tax benefit (214,493) (482,425)
Net (loss) income (6,719,730) 5,096,856 (12,798,872) (3,154,181)
Series A cumulative preferred dividends (366,641) (85,993) (912,946)
Undistributed earnings to participating securities (1,838,354)
Deemed dividend related to the make-whole provision for the conversion of Series A convertible preferred stock into common stock (8,167,895)
Net (loss) income attributable to common stockholders $ (6,719,730) $ 2,891,861 $ (21,052,760) $ (4,067,127)
Per share information:        
Net (loss) income per share of common stock, basic (in dollars per share) $ (0.13) $ 0.21 $ (0.44) $ (0.35)
Net (loss) income per share of common stock, diluted (in dollars per share) $ (0.13) $ 0.20 $ (0.44) $ (1.83)
Weighted average shares outstanding, basic (in shares) 50,572,001 13,937,869 47,777,757 11,709,128
Weighted average shares outstanding, diluted (in shares) 50,572,001 14,714,853 47,777,757 12,525,707