CONDENSED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
CONDENSED BALANCE SHEETS (Unaudited) (Parenthetical) [Abstract]
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	5,000,000	5,000,000
Series A Junior Participating Preferred Stock, shares authorized (in shares)	15,000	15,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	175,000,000	175,000,000
Common stock, shares issued (in shares)	109,857,885	109,840,445
Common stock, shares outstanding (in shares)	109,857,885	109,840,445
Treasury stock (in shares)	633,816	633,816