CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
License revenue	$ 100,000	$ 0	$ 100,000	$ 0
Expenses:
Research and development	12,452,340	10,008,304	20,604,559	22,573,181
General and administrative	6,128,904	4,191,769	10,087,340	7,322,001
Total expenses	18,581,244	14,200,073	30,691,899	29,895,182
Loss before other income (loss)	(18,481,244)	(14,200,073)	(30,591,899)	(29,895,182)
Other income (loss):
Interest income	65,436	46,455	127,174	103,029
Interest expense	(741,346)	0	(1,158,148)	0
Other income (loss), net	(798)	30,660	6,081	15,940
Gain on warrant derivative liability	877,729	2,435,865	693,457	564,570
Net loss	$ (18,280,223)	$ (11,687,093)	$ (30,923,335)	$ (29,211,643)
Basic and diluted loss per share (in dollars per share)	$ (0.27)	$ (0.21)	$ (0.46)	$ (0.52)
Basic and diluted weighted-average shares outstanding (in shares)	67,398,837	55,726,432	66,893,846	55,724,581