Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	45,000,000	85,000,000
Common stock, shares issued	24,289,523	24,210,644
Common stock, shares outstanding	22,614,679	22,960,669
Treasury stock, shares	1,674,844	1,249,975