Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Assumptions Used in Estimating Fair Value (Details)

v3.19.2
Fair Value Measurements - Schedule of Assumptions Used in Estimating Fair Value (Details) - Common Stock Warrants [Member]
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Black-Scholes-Merton Valuation Model [Member] | Weighted-Average Risk-Free Interest Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, percentages 0.0223 0.0251
Black-Scholes-Merton Valuation Model [Member] | Weighted-Average Expected Life [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, term 4 years 1 month 6 days 10 months 25 days
Black-Scholes-Merton Valuation Model [Member] | Expected Dividend Yield [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, percentages 0.00 0.00
Black-Scholes-Merton Valuation Model [Member] | Weighted-Average Expected Volatility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, percentages 0.68 1.57
Monte Carlo Simulation Valuation Model [Member] | Weighted-Average Risk-Free Interest Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, percentages 0.0172 0.0246
Monte Carlo Simulation Valuation Model [Member] | Weighted-Average Expected Life [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, term 2 years 4 months 24 days 3 years 1 month 6 days
Monte Carlo Simulation Valuation Model [Member] | Expected Dividend Yield [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, percentages 0.00 0.00
Monte Carlo Simulation Valuation Model [Member] | Weighted-Average Expected Volatility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value assumptions, measurement input, percentages 0.64 0.68