Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Stockholders' equity    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 200,000,000 100,000,000
Common stock, shares issued (in shares) 61,265,156 58,673,215
Common stock, shares outstanding (in shares) 57,837,919 55,319,239
Treasury stock, at cost (in shares) 3,427,237 3,353,976