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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Licensing revenue $ 125,000 $ 125,000
Operating expenses:    
Research and development 3,441,171 4,506,408
General and administrative 1,862,525 2,031,840
Total operating expenses 5,303,696 6,538,248
Loss from operations $ (5,178,696) (6,413,248)
Other (expense) income:    
Loss from valuation of common stock warrant liability (43,228)
Loss from valuation of earn-out milestone liability $ (302,656) (172,136)
Investment income, net 9,341 16,380
Interest expense (244,198) (392,303)
Other expense (258) (533)
Total other (expense) income, net (537,771) (591,820)
Net loss attributable to common shareholders $ (5,716,467) $ (7,005,068)
Basic and diluted (in dollars per share) $ (0.24) $ (0.35)
Weighted average shares outstanding    
Basic and diluted (in shares) 23,388,917 19,990,217