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Warrants - Weighted-Average Assumptions In Computation of Fair Value (Details) - Warrants
Sep. 30, 2018
Dec. 31, 2017
Remaining contractual term (in years)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Warrants, term 4 years 8 months 12 days 5 years 3 months 18 days
Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Warrants, measurement input 0.5266 0.5906
Risk-free interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Warrants, measurement input 0.0267 0.0216
Dividend yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Warrants, measurement input 0 0