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Stockholders' Equity (Details 3) - Warrant [Member] - $ / shares
6 Months Ended 12 Months Ended
Jul. 17, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Weighted average fair value per warrant $ 5.03 $ 5.85 $ 5.11 $ 3.76 $ 5.84 $ 4.87
Risk-free interest rate 0.99% 1.47% 1.76% 2.47% 2.45% 1.18%
Expected lives 7 years 6 months 3 years 4 years 5 years 6 years 7 years
Expected volatility 36.98% 34.03% 28.99% 44.99% 37.49% 28.18%