Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Licensing revenue	$ 125,000		$ 250,000
Operating expenses:
Research and development	2,022,576	4,112,243	5,225,753	8,805,250
General and administrative	1,950,720	1,595,281	3,639,449	3,165,747
Total operating expenses	3,973,296	5,707,524	8,865,202	11,970,997
Loss from operations	(3,848,296)	(5,707,524)	(8,615,202)	(11,970,997)
Other income (expense):
Gain (loss) from change in valuation of common stock warrant liability	4,380,120	(447,323)	8,660,417	(369,723)
Investment income, net	67,132	62,076	83,695	67,409
Interest expense	(176,211)	(10,574)	(357,139)	(16,275)
Other expense	(1,861)	(1,040)	(1,861)	(1,040)
Total other income (expense), net	4,269,180	(396,861)	8,385,112	(319,629)
Net income (loss)	420,884	(6,104,385)	(230,090)	(12,290,626)
Non-cash deemed dividend from beneficial conversion feature on convertible preferred stock			(4,601,410)
Net income (loss) attributable to common shareholders	$ 420,884	$ (6,104,385)	$ (4,831,500)	$ (12,290,626)
Net income (loss) attributable to common shareholders per common share
Basic (in Dollars per share)	$ 0.01	$ (0.18)	$ (0.10)	$ (0.37)
Diluted (in Dollars per share)		$ (0.18)	$ (0.10)	$ (0.37)
Weighted average shares outstanding
Basic (in Shares)	54,391,516	33,236,060	48,631,514	33,211,059
Diluted (in Shares)	61,279,766	33,236,060	48,631,514	33,211,059