Condensed Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating expenses:
Research and development	$ 1,388,791	$ 2,017,569	$ 2,774,157	$ 2,788,255
General and administrative	917,305	871,979	1,949,550	2,081,549
Total operating expenses	2,306,096	2,889,548	4,723,707	4,869,804
Loss from operations	(2,306,096)	(2,889,548)	(4,723,707)	(4,869,804)
Other income (expense):
Interest income	2,903	1,667	4,335	2,631
Change in fair value of warrant liability		1,261,912	433,392	(1,810,835)
Total other income (expense)	2,903	1,263,579	437,727	(1,808,204)
Net loss	$ (2,303,193)	$ (1,625,969)	$ (4,285,980)	$ (6,678,008)
Net loss per share of common stock, basic	$ (0.14)	$ (0.11)	$ (0.27)	$ (0.46)
Net loss per share of common stock, diluted	$ (0.14)	$ (0.13)	$ (0.27)	$ (0.49)
Weighted-average shares used to compute basic net loss per share	16,425,468	15,343,325	15,926,253	14,435,818
Weighted-average shares used to compute diluted net loss per share	16,425,468	15,420,954	15,926,253	14,474,633