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Stockholders' Equity (Details 4) (Warrant [Member], USD $)
6 Months Ended 12 Months Ended
Jul. 17, 2012
Dec. 31, 2013
Dec. 31, 2012
Warrant [Member]
     
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Weighted average fair value per warrant $ 5.03 $ 5.84 $ 4.87
Risk-free interest rate 0.99% 2.45% 1.18%
Expected lives 7 years 6 months 6 years 7 years
Expected volatility 36.98% 37.49% 28.18%