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Condensed Consolidated Statements of Operations (unaudited) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Revenues $ 0 $ 0
Expenses:    
Research and development 4,685,720 4,737,575
General and administrative 793,178 1,099,832
Total expenses 5,478,898 5,837,407
Loss before other income (expense) and taxes (5,478,898) (5,837,407)
Interest income 3,794 2,514
Interest expense (452,659) (264,827)
Financing expense 0 (14,636)
Change in fair value of warrant liability 102,776 481,011
Loss before provision for income taxes (5,824,987) (5,633,345)
Provision for income taxes 0 0
Net loss $ (5,824,987) $ (5,633,345)
Net loss per share (in USD per share) $ (1.64) $ (2.47)
Weighted average number of shares basic and diluted (in shares) 3,549,514 2,281,815