Condensed Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating expenses:
Research and development	$ 1,385,366	$ 770,686
General and administrative	1,032,245	1,209,570
Total operating expenses	2,417,611	1,980,256
Loss from operations	(2,417,611)	(1,980,256)
Other income (expense):
Interest income	1,433	964
Change in fair value of warrant liability	433,392	(3,072,747)
Total other income (expense), net	434,825	(3,071,783)
Net loss	$ (1,982,786)	$ (5,052,039)
Net loss per share of common stock, basic and diluted	$ (0.13)	$ (0.37)
Weighted-average shares used to compute basic and diluted net loss per share	15,427,037	13,528,311