Condensed Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating expenses:
Research and development	$ 2,620,554	$ 2,552,689	$ 5,196,682	$ 5,339,759
General and administrative	2,208,059	2,048,157	4,601,179	4,319,322
Operating loss	(4,828,613)	(4,600,846)	(9,797,861)	(9,659,081)
Interest income	13,934	3,009	34,465	3,961
Other income, net	5,022	4,999	11,670	12,497
Gain on sale of fixed assets		1,500		27
Net loss	$ (4,809,657)	$ (4,591,338)	$ (9,751,726)	$ (9,642,596)
Basic and diluted net loss per common share	$ (0.19)	$ (0.20)	$ (0.39)	$ (0.42)
Basic and diluted weighted average number of common shares outstanding	25,262,538	23,028,854	25,262,538	22,886,964