CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue:
License revenue	$ 0	$ 0	$ 0	$ 0
Expenses:
Research and development	8,470,592	10,637,963	31,043,741	28,054,935
General and administrative	2,188,656	2,412,848	9,510,657	8,453,048
Total expenses	10,659,248	13,050,811	40,554,398	36,507,983
Loss before other income	(10,659,248)	(13,050,811)	(40,554,398)	(36,507,983)
Other income:
Interest income	68,678	78,735	171,707	238,750
Other income, net	2,040	20,779	17,948	28,680
Gain on warrant derivative liability	3,515,178	7,326,049	4,079,748	19,560,350
Net loss	$ (7,073,352)	$ (5,625,248)	$ (36,284,995)	$ (16,680,203)
Basic and diluted net loss per share (in dollars per share)	$ (0.11)	$ (0.10)	$ (0.62)	$ (0.31)
Basic and diluted weighted-average shares outstanding (in shares)	63,848,208	55,703,715	58,462,214	53,918,141