Condensed Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating expenses:
Research and development	$ 2,717,698	$ 1,339,343	$ 5,505,953	$ 5,449,568
General and administrative	984,047	830,092	3,065,595	2,770,500
Total operating expenses	3,701,745	2,169,435	8,571,548	8,220,068
Loss from operations	(3,701,745)	(2,169,435)	(8,571,548)	(8,220,068)
Other income (expense):
Interest income (expense), net	2,822	(123,209)	5,452	(268,483)
Financing costs related to warrant liability		(533,692)		(533,692)
Change in fair value of warrant liability	(1,544,138)	(198,945)	(3,354,973)	(198,945)
Total other expense, net	(1,541,316)	(855,846)	(3,349,521)	(1,001,120)
Net loss	$ (5,243,061)	$ (3,025,281)	$ (11,921,069)	$ (9,221,188)
Net loss per share of common stock, basic	$ (0.34)	$ (0.29)	$ (0.81)	$ (1.11)
Net loss per share of common stock, diluted	$ (0.34)	$ (0.29)	$ (0.89)	$ (1.11)
Weighted-average shares used to compute basic net loss per share	15,351,295	10,614,692	14,740,977	8,341,750
Weighted-average shares used to compute diluted net loss per share	15,351,295	10,614,692	14,766,853	8,341,750