Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Assumptions Used for Valuation of Fair Value Liabilities (Details)

v3.19.2
Fair Value Measurement - Summary of Assumptions Used for Valuation of Fair Value Liabilities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Risk Free Interest Rate [Member] | Minimum [Member]        
Fair value assumptions, measurement input, percentages 1.88% 2.39% 1.88% 1.62%
Risk Free Interest Rate [Member] | Maximum [Member]        
Fair value assumptions, measurement input, percentages 2.45% 2.63% 2.45% 2.63%
Contractual Term (Years) [Member] | Minimum [Member]        
Fair value assumptions, measurement input, term 1 year 3 months 11 days 1 year 2 months 30 days
Contractual Term (Years) [Member] | Maximum [Member]        
Fair value assumptions, measurement input, term 10 years 3 years 10 years 3 years 2 months 30 days
Expected Volatility [Member] | Minimum [Member]        
Fair value assumptions, measurement input, percentages 106.00% 131.00% 106.00% 113.00%
Expected Volatility [Member] | Maximum [Member]        
Fair value assumptions, measurement input, percentages 139.00% 171.00% 140.00% 171.00%
Expected Dividend Yield [Member]        
Fair value assumptions, measurement input, percentages 0.00% 0.00% 0.00% 0.00%