Condensed Balance Sheets Parenthetical (USD $)	Sep. 30, 2011	Dec. 31, 2010
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	60,000,000	60,000,000
Preferred stock, shares issued	13,375,983	16,205,268
Preferred stock, shares outstanding	13,375,983	16,205,268
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	20,168,813	18,751,128
Common stock, shares outstanding	20,168,813	18,751,128