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Stock-Based Compensation (Details 4) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of all stock option plans        
Number of Shares/Warrants, Options Outstanding, Beginning Balance 1,709,400      
Number of Shares/Warrants, Options Outstanding, Ending Balance   1,709,400    
Warrant [Member]        
Summary of all stock option plans        
Number of Shares/Warrants, Options Outstanding, Beginning Balance 3,335,073 828,573 4,704,636 5,405,606
Warrants, Issued 2,575,000  
Warrants, Expired/cancelled (2,591,000) (40,000)  
Number of Shares, Options Exercised (280,000) (28,500) (3,876,063)  
Number of Shares/Warrants, Options Outstanding, Ending Balance 464,073 3,335,073 828,573 4,704,636
Weighted Average Exercise Price, Options Outstanding, Beginning Balance $ 4.45 $ 2.39 $ 1.61  
Weighted Average Exercise Price, Granted 5.09  
Weighted Average Exercise Price,Options Cancelled or expired $ 5.06 3.98  
Weighted Average Exercise Price, Options Exercised 1.30 2.85 $ 1.45  
Weighted Average Exercise Price, Options Outstanding, Ending Balance $ 3.02 $ 4.45 $ 2.39 $ 1.61
Weighted Average Remaining Contractual Life, Outstanding and exercisable 2 months 9 days 11 months 5 days 2 years 22 days 1 year 4 months 28 days