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Stock Option Plans and Warrants to Purchase Common Stock (Details 5)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
6/25/2013 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 0.8
Remaining Contractual Life in Years 5 months 23 days
Outstanding Warrants 11,250
Exercisable Warrants 11,250
12/5/2013 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 20.5
Remaining Contractual Life in Years 11 months 4 days
Outstanding Warrants 500
Exercisable Warrants 500
12/24/2014 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 14.8
Remaining Contractual Life in Years 1 year 11 months 23 days
Outstanding Warrants 110,932
Exercisable Warrants 110,932
12/16/2016 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 3.95
Remaining Contractual Life in Years 3 years 11 months 15 days
Outstanding Warrants 2,403,405
Exercisable Warrants 2,403,405
11/3/2017 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 2.5
Remaining Contractual Life in Years 4 years 9 months 29 days
Outstanding Warrants 51,151
Exercisable Warrants
Total [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Remaining Contractual Life in Years 3 years 9 months 11 days
Outstanding Warrants 2,577,238
Exercisable Warrants 2,526,087