Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenues	$ 0	$ 0	$ 0	$ 0
Expenses:
Research and development	4,433,222	2,299,903	9,170,797	4,365,862
General and administrative	1,049,815	1,087,686	2,149,647	2,122,847
Total expenses	5,483,037	3,387,589	11,320,444	6,488,709
Loss before other income (expense) and taxes	(5,483,037)	(3,387,589)	(11,320,444)	(6,488,709)
Interest income	6,397	5,653	8,911	8,910
Interest expense	(281,996)	0	(546,823)	0
Financing expense	(16,595)	0	(31,231)	(88,939)
Change in fair value of warrant liability	445,660	227,206	926,671	1,989,162
Loss before provision for income taxes	(5,329,571)	(3,154,730)	(10,962,916)	(4,579,576)
Provision for income taxes	0	0	0	0
Net loss	$ (5,329,571)	$ (3,154,730)	$ (10,962,916)	$ (4,579,576)
Net loss per share (in USD per share)	$ (0.06)	$ (0.03)	$ (0.12)	$ (0.05)
Weighted average number of shares basic and diluted (in shares)	92,878,262	90,254,823	92,072,062	84,070,845