Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating expenses:
Research and development	$ 6,951,600	$ 8,154,144
General and administrative	3,592,825	3,664,159
Total operating expenses	10,544,425	11,818,303
Loss from operations	(10,544,425)	(11,818,303)
Other expenses:
Interest expense, net	(268,029)	(303,160)
Financing costs related to warrant liability	(533,692)
Change in fair value of warrant liability	597,615
Total other expenses	(204,106)	(303,160)
Net loss	$ (10,748,531)	$ (12,121,463)
Net loss per common share, basic and diluted	$ (1.15)	$ (1.87)
Weighted-average shares used to compute basic and diluted net loss per share	9,338,068	6,485,794