Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Fair Value Assumptions (Details)

v3.19.1
Summary of Significant Accounting Policies - Summary of Fair Value Assumptions (Details)
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Risk-free interest rate | Minimum | Warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input   0.023 0.015
Risk-free interest rate | Maximum | Warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input   0.025 0.020
Expected life | Minimum | Warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input (years)   1 year 9 months 18 days 2 years 6 months
Expected life | Maximum | Warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input (years)   2 years 2 months 12 days 3 years
Expected volatility | Minimum | Warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input   0.65 0.50
Expected volatility | Maximum | Warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input   0.70 0.60
Dividends      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input 0    
Dividends | Warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Measurement input   0 0