CONDENSED BALANCE SHEETS (Unaudited) Parenthetical (USD $)	Sep. 30, 2011	Dec. 31, 2010
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	30,000,000	30,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Stock, shares authorized (in shares)	160,000,000	160,000,000
Common Stock, shares issued (in shares)	90,418,871	87,238,301
Common Stock, shares outstanding (in shares)	90,418,871	87,238,301
Class A Stock [Member]
Stockholders' equity
Common Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Stock, shares authorized (in shares)	40,000,000	40,000,000
Common Stock, shares issued (in shares)	2,109,512	2,182,036
Common Stock, shares outstanding (in shares)	2,109,512	2,182,036