Statement of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating expenses:
Research and development expenses	$ 6,507,972	$ 2,418,915	$ 12,574,455	$ 5,636,021
General and administrative expenses	1,976,888	1,141,434	5,052,983	3,540,804
Total operating expenses	8,484,860	3,560,349	17,627,438	9,176,825
Loss from operations	(8,484,860)	(3,560,349)	(17,627,438)	(9,176,825)
Other income (expense):
Warrant remeasurement	(1,433,502)	89,293	(1,879,823)	183,817
Interest income	1,333	895	2,810	2,592
Interest expense	(213,021)	(47,972)	(615,047)	(47,972)
Loss before income taxes	(10,130,050)	(3,518,133)	(20,119,498)	(9,038,388)
Benefit for income taxes	0	0	0	0
Net loss	(10,130,050)	(3,518,133)	(20,119,498)	(9,038,388)
Cumulative dividend on Series C, C-1 and C-2 convertible preferred stock	(1,827,568)	(364,666)	(4,257,083)	(1,082,107)
Net loss attributable to common stockholders	$ (11,957,618)	$ (3,882,799)	$ (24,376,581)	$ (10,120,495)
Loss per share attributable to common stockholders basic and diluted (in dollars per share)	$ (7.08)	$ (2.30)	$ (14.44)	$ (5.99)
Weighted average common shares outstanding basic and diluted (in shares)	1,688,475	1,688,475	1,688,475	1,688,475