Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Stockholders' equity:    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 58,673,215 55,339,160
Common stock, shares outstanding 55,319,239 52,329,248
Treasury stock, at cost 3,353,976 3,009,912