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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Preferred Stock, Par or Stated Value Per Share $ 0.0001 $ 0.0001
Preferred stock, authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Common Stock, Par or Stated Value Per Share $ 0.00010 $ 0.0001
Common stock, authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 24,007,581 23,840,683
Treasury stock, shares (in shares) 2,923,640 853,470