Condensed Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Operating expenses:
Research and development	$ 2,437,811	$ 2,936,671	$ 7,634,493	$ 8,276,430
General and administrative	3,689,991	2,033,172	8,291,170	6,352,492
Operating loss	(6,127,802)	(4,969,843)	(15,925,663)	(14,628,922)
Interest income	10,729	9,741	45,194	13,702
Other income, net	6,419	4,998	18,089	17,521
Net loss	$ (6,110,654)	$ (4,955,104)	$ (15,862,380)	$ (14,597,699)
Basic and diluted net loss per common share	$ (0.24)	$ (0.20)	$ (0.63)	$ (0.62)
Basic and diluted weighted average number of common shares outstanding	25,262,538	25,110,970	25,262,538	23,636,446