Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended		94 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Operating expenses:
Research and development	$ 3,021,166	$ 1,374,852	$ 6,825,507	$ 3,622,800	$ 22,085,136
General and administrative	2,385,534	1,466,049	6,504,693	4,433,929	21,159,886
Total operating expenses	5,406,700	2,840,901	13,330,200	8,056,729	43,245,022
Operating loss	(5,406,700)	(2,840,901)	(13,330,200)	(8,056,729)	(43,245,022)
Other income (expense):
Other income					383,000
Interest income	4,153	13,061	13,064	27,842	68,297
Interest expense	(34,053)	(12,454)	(95,408)	(28,147)	(1,233,465)
Modification of warrants			(764,769)		(764,769)
Derivatives gain (loss)		10,869,209	(18,871,329)	21,436,653	(31,409,816)
Other income (expense), net	(29,900)	10,869,816	(19,718,442)	21,436,348	(32,956,753)
Net income (loss)	$ (5,436,600)	$ 8,028,915	$ (33,048,642)	$ 13,379,619	$ (76,201,775)
Net income (loss) per share, basic	$ (0.07)	$ 0.12	$ (0.46)	$ 0.21	$ (1.96)
Net income (loss) per share, diluted	$ (0.07)	$ 0.11	$ (0.46)	$ 0.19	$ (1.96)
Weighted average number of common shares outstanding, basic	78,603,114	65,109,037	72,391,396	62,357,300	38,880,668
Weighted average number of common shares outstanding, diluted	78,603,114	74,157,957	72,391,396	71,734,784	38,880,668