Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Licensing revenue
Expenses:
Research and development	818,629	6,167,074	2,275,045	12,934,058
General and administrative	1,689,553	3,137,008	4,153,112	6,116,063
Total expenses	2,508,182	9,304,082	6,428,157	19,050,121
Loss before other income	(2,508,182)	(9,304,082)	(6,428,157)	(19,050,121)
Other income (loss):
Interest income	92,975	90,849	175,909	151,392
Interest expense	(659,860)	(848,395)	(1,352,647)	(2,171,110)
Other income (loss), net	(8,134)	7,276	(7,292)	3,504
Gain (loss) on warrant derivative liabilities	73,613	(4,303,945)	527,025	(4,336,066)
Net loss	$ (3,009,588)	$ (14,358,297)	$ (7,085,162)	$ (25,402,401)
Basic and diluted net loss per share	$ (0.10)	$ (0.60)	$ (0.25)	$ (1.20)
Basic and diluted weighted-average shares outstanding	30,283,814	23,178,389	28,845,650	21,065,708