Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue:
License fees and milestones	$ 37,500	$ 37,500	$ 75,000	$ 786,667
Collaborative research and development	250,000	250,000	500,000	500,000
Total revenue	287,500	287,500	575,000	1,286,667
Operating expense:
Research and development	4,599,325	4,915,899	11,172,135	9,705,514
General and administrative	965,132	958,834	2,162,315	1,982,875
Total operating expense	5,564,457	5,874,733	13,334,450	11,688,389
Loss from operations	(5,276,957)	(5,587,233)	(12,759,450)	(10,401,722)
Other income (loss), net	(36)	12,194	8,602	15,714
Interest income, net	18,022	16,249	21,217	34,065
Net loss	$ (5,258,971)	$ (5,558,790)	$ (12,729,631)	$ (10,351,943)
Basic and diluted net loss per share	$ (0.07)	$ (0.09)	$ (0.19)	$ (0.17)
Weighted average shares used to compute basic and diluted net loss per share	75,071,418	61,835,222	68,789,220	61,698,884