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Fair Value of Financial Instruments - Valuation Assumptions for Warrant Liabilities (Details) - Significant Unobservable Inputs (Level 3) - Valuation Technique, Option Pricing Model
Mar. 31, 2020
$ / shares
Mar. 31, 2019
$ / shares
Common stock price    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input 11.61 25.87
Risk free interest rate    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input 0.0023  
Risk free interest rate | Minimum    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input   0.0221
Risk free interest rate | Maximum    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input   0.0231
Expected life    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, expected life 2 years 21 days  
Expected life | Minimum    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, expected life   1 year 8 months 1 day
Expected life | Maximum    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, expected life   3 years 21 days
Expected volatility    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input 0.614  
Expected volatility | Minimum    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input   0.423
Expected volatility | Maximum    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input   0.457
Dividend yield    
Key Inputs and Assumptions, Valuation Techniques    
Warrant liability, measurement input 0 0