Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v2.4.0.6
Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Stockholders' equity    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 54,405,296 53,586,726
Common stock, shares outstanding (in shares) 51,632,704 50,864,618
Treasury stock, (in shares) 2,772,592 2,722,108