STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
STATEMENTS OF OPERATIONS [Abstract]
Licensing revenue	$ 2,000,000	$ 0
Operating expenses:
Research and development	19,863,836	14,714,460
General and administrative	5,154,933	4,922,967
Total operating expenses	25,018,769	19,637,427
Loss from operations	(23,018,769)	(19,637,427)
Other income (expense):
Other income	42,149	244,460
Change in valuation of common stock warrant liability	81,733	573,760
Interest income	174,064	32,289
Interest expense	(501,855)	(31,517)
Total other (expense) income	(203,909)	818,992
Loss before income taxes	(23,222,678)	(18,818,435)
Income tax benefit	0	0
Net loss	$ (23,222,678)	$ (18,818,435)
Net loss per common share - basic and diluted (in dollars per share)	$ (1.11)	$ (1.52)
Weighted average common shares outstanding - basic and diluted (in shares)	20,917,678	12,375,402