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Stock Options and Equity-Classified Warrants, Warrants, Shares purchased and intrinsic value (Details) - USD ($)
12 Months Ended
Nov. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Aug. 01, 2016
Jul. 24, 2015
Mar. 31, 2014
Feb. 05, 2014
Oct. 15, 2013
Aug. 31, 2013
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Closing price of the common stock (in dollars per share)           $ 2.75   $ 6.50 $ 2.25  
Exercise price of warrant issued (in dollars per share)   $ 30                
Restricted stock expense   $ 0 $ 626,900 $ 186,389            
Vesting period   3 years                
Subsequent Event [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Exercise price of warrant issued (in dollars per share)         $ 4.48          
Number of warrants to be expired (in shares)         6,371,899          
Stock Options [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
The aggregate intrinsic value of outstanding options   $ 3,800,000                
Aggregate intrinsic value of options exercised   200,000                
Aggregate intrinsic value of options vested   $ 2,300,000                
Closing price of the common stock (in dollars per share)   $ 2.65                
Warrants [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Number of warrants issued (in shares) 2                  
Number of shares purchased (in shares)                   500,000
Exercise price of warrant issued (in dollars per share)                   $ 2.50
Warrants One [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Number of shares purchased (in shares) 125,000                  
Exercise price of warrant issued (in dollars per share) $ 3.00                  
Warrants Two [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Number of shares purchased (in shares) 125,000                  
Exercise price of warrant issued (in dollars per share) $ 3.75                  
Warrants Three [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Number of shares purchased (in shares) 250,000                  
Vesting period 3 years                  
Warrants Four [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Number of shares purchased (in shares)             25,000      
Exercise price of warrant issued (in dollars per share)             $ 5.60      
Cashless Exercise [Member]                    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                    
Number of warrants issued (in shares)   10,000 62,172 0