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Stock Option Plans and Warrants to Purchase Common Stock (Details Textual) - Subsequent Event Type [Domain] - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2010
Sep. 30, 2007
Stock Option Plans and Warrants To Purchase Common Stock (Textual)                
Share-based compensation $ 137,163 $ 121,257 $ 279,188 $ 297,919 $ 720,150 $ 803,060    
Compensation cost for stock options not yet recognized         $ 1,009,941      
Recognition period of share based compensation expense         3 years      
Ending Balance, weighted average options/warrants exercise price         $ 1.65      
Options intrinsic value         $ 47,241 $ 56,750    
Class of warrants exercised         586,081      
Employees [Member]                
Stock Option Plans and Warrants To Purchase Common Stock (Textual)                
Number of options available under 2005 Equity Incentive Plan         569,000      
Board [Member]                
Stock Option Plans and Warrants To Purchase Common Stock (Textual)                
Number of options available under 2005 Equity Incentive Plan         68,495      
Warrant [Member]                
Stock Option Plans and Warrants To Purchase Common Stock (Textual)                
Warrant expired or cancelled         (1,470,263) (1,250)    
Options granted         1,169,318 5,421,581    
Exercisable Options/Warrants         7,269,500      
Ending Balance         7,269,500 8,156,526    
Ending Balance, weighted average options/warrants exercise price         $ 1.48      
Weighted-Average Remaining Contractual Life in Years         3 years 4 months 24 days      
Expired, weighted average warrant exercise price         $ 3.49 $ 15.00    
Equity Incentive Plan [Member]                
Stock Option Plans and Warrants To Purchase Common Stock (Textual)                
Number of options available under 2005 Equity Incentive Plan           3,000,000 1,750,000 1,000,000
Employee Stock Option [Member]                
Stock Option Plans and Warrants To Purchase Common Stock (Textual)                
Options granted         637,495 791,100    
Weighted average exercise price         $ 2.64 $ 3.01    
Exercisable Options/Warrants         1,875,609      
Exercisable, Weighted Average Remaining Contractual Term         6 years 10 months 24 days      
Options, intrinsic value         $ 196,655      
Ending Balance         2,488,279 2,051,511    
Ending Balance, weighted average options/warrants exercise price         $ 2.40      
Weighted-Average Remaining Contractual Life in Years         6 years 10 months 24 days      
Options intrinsic value         $ 215,103