CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Licensing revenue	$ 0	$ 0
Expenses:
Research and development	4,401,515	4,820,708
General and administrative	1,914,715	2,049,463
Total expense	6,316,230	6,870,171
Loss before other income	(6,316,230)	(6,870,171)
Other income:
Interest income	35,458	55,428
Other income, net	34,059	37,031
Loss (gain) on warrant derivative liability	(3,888,166)	600,473
Loss before provision for income taxes	(10,134,879)	(6,177,239)
Provision for income taxes	0	97,996
Net loss	$ (10,134,879)	$ (6,275,235)
Basic and diluted net loss per share (in dollars per share)	$ (0.07)	$ (0.06)
Basic and diluted weighted-average shares outstanding (in shares)	148,427,069	109,213,838