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Convertible Notes Payable - Schedule of Inputs Used to Value the Series D Warrants (Details)
Sep. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
June 2018 Series D Warrants [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life     5 years  
June 2018 Pre-Funded Series D Warrants [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life     5 years  
Contractual Term [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life 5 years      
Contractual Term [Member] | Minimum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life   1 year 1 month 6 days   9 months 25 days
Contractual Term [Member] | Maximum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life   5 years 1 month 6 days   4 years 10 months 17 days
Contractual Term [Member] | June 2018 Series D Warrants [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life   5 years    
Contractual Term [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Minimum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life   5 years 6 months    
Contractual Term [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Maximum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Contractual life   6 years 6 months    
Expected Volatility [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input 2.018      
Expected Volatility [Member] | Minimum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   1.457   1.309
Expected Volatility [Member] | Maximum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   2.653   2.669
Expected Volatility [Member] | June 2018 Series D Warrants [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   1.9410    
Expected Volatility [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Minimum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   2.150    
Expected Volatility [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Maximum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   3.890    
Risk-free Interest Rates [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input 0.016      
Risk-free Interest Rates [Member] | Minimum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   0.025   0.017
Risk-free Interest Rates [Member] | Maximum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   0.026   0.021
Risk-free Interest Rates [Member] | June 2018 Series D Warrants [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   0.0278    
Risk-free Interest Rates [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Minimum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   0.0213    
Risk-free Interest Rates [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Maximum [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Warrants measurement input   0.0230