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Warrants - Summary of Assumptions Used to Estimate Fair Value of Warrants Granted (Details)
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dividend Yield [Member]      
Class of Warrant or Right [Line Items]      
Warrants, measurement input 0.00 0 0
Expected Volatility [Member]      
Class of Warrant or Right [Line Items]      
Warrants, measurement input 217   200
Expected Volatility [Member] | Minimum [Member]      
Class of Warrant or Right [Line Items]      
Warrants, measurement input   231  
Expected Volatility [Member] | Maximum [Member]      
Class of Warrant or Right [Line Items]      
Warrants, measurement input   632  
Risk Free Interest Rate [Member]      
Class of Warrant or Right [Line Items]      
Warrants, measurement input 2.75    
Risk Free Interest Rate [Member] | Minimum [Member]      
Class of Warrant or Right [Line Items]      
Warrants, measurement input   2.55 1.81
Risk Free Interest Rate [Member] | Maximum [Member]      
Class of Warrant or Right [Line Items]      
Warrants, measurement input   2.75 1.84
Expected Life of Warrants [Member]      
Class of Warrant or Right [Line Items]      
Warrants, term 5 years   5 years
Expected Life of Warrants [Member] | Minimum [Member]      
Class of Warrant or Right [Line Items]      
Warrants, term   5 years  
Expected Life of Warrants [Member] | Maximum [Member]      
Class of Warrant or Right [Line Items]      
Warrants, term   8 years