Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Licensing revenue	$ 125,000		$ 375,000
Operating expenses:
Research and development	2,269,228	3,539,309	7,494,981	12,344,559
General and administrative	1,389,539	1,420,258	5,028,988	4,586,005
Total operating expenses	3,658,767	4,959,567	12,523,969	16,930,564
Loss from operations	(3,533,767)	(4,959,567)	(12,148,969)	(16,930,564)
Other income (expense):
(Loss) gain from change in valuation of common stock warrant liability	(518,843)	(881,127)	8,141,574	(1,250,850)
Investment income (loss), net	144,532	(5,581)	228,227	61,828
Interest expense	(162,774)	(171,720)	(519,913)	(187,995)
Other expense	(669)		(2,530)	(1,040)
Total other income (expense), net	(537,754)	(1,058,428)	7,847,358	(1,378,057)
Net loss	(4,071,521)	(6,017,995)	(4,301,611)	(18,308,621)
Non-cash deemed dividend from beneficial conversion feature on convertible preferred stock			(4,601,410)
Net loss attributable to common shareholders	$ (4,071,521)	$ (6,017,995)	$ (8,903,021)	$ (18,308,621)
Net loss attributable to common shareholders per common share – basic and diluted (in Dollars per share)	$ (0.30)	$ (0.80)	$ (0.76)	$ (2.47)
Weighted average shares outstanding – basic and diluted (in Shares)	13,601,800	7,475,958	11,755,611	7,425,072