CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
License revenue	$ 0	$ 0	$ 100,000	$ 0
Expenses:
Research and development	8,927,037	8,470,592	29,531,609	31,043,741
General and administrative	2,771,732	2,188,656	12,859,069	9,510,657
Total expenses	11,698,769	10,659,248	42,390,678	40,554,398
Loss before other income (loss)	(11,698,769)	(10,659,248)	(42,290,678)	(40,554,398)
Other income (loss):
Interest income	68,635	68,678	195,809	171,707
Interest expense	(781,038)	0	(1,939,186)	0
Other income (loss), net	(10,489)	2,040	(4,398)	17,948
Gain on warrant derivative liability	246,211	3,515,178	939,668	4,079,748
Net loss	$ (12,175,450)	$ (7,073,352)	$ (43,098,785)	$ (36,284,995)
Basic and diluted net loss per share (in dollars per share)	$ (0.13)	$ (0.11)	$ (0.57)	$ (0.62)
Basic and diluted weighted-average shares outstanding (in shares)	91,042,450	63,848,208	75,001,770	58,462,214