Condensed Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating expenses:
Research and development	$ 2,017,569	$ 2,095,149	$ 2,788,255	$ 4,110,225
General and administrative	871,979	802,655	2,081,549	1,940,408
Total operating expenses	2,889,548	2,897,804	4,869,804	6,050,633
Loss from operations	(2,889,548)	(2,897,804)	(4,869,804)	(6,050,633)
Other income (expense):
Interest income (expense), net	1,667	(72,694)	2,631	(145,274)
Change in fair value of warrant liability	1,261,912		(1,810,835)
Total other income (expense), net	1,263,579	(72,694)	(1,808,204)	(145,274)
Net loss	$ (1,625,969)	$ (2,970,498)	$ (6,678,008)	$ (6,195,907)
Net loss per share of common stock, basic	$ (0.11)	$ (0.41)	$ (0.46)	$ (0.86)
Net loss per share of common stock, diluted	$ (0.19)	$ (0.41)	$ (0.55)	$ (0.86)
Weighted-average shares used to compute basic net loss per share	15,343,325	7,217,577	14,435,818	7,192,791
Weighted-average shares used to compute diluted net loss per share	15,421,057	7,217,577	14,474,684	7,192,791