Annual report pursuant to Section 13 and 15(d)

Warrants and Derivative Liabilities (Details 2)

v3.20.1
Warrants and Derivative Liabilities (Details 2) - Emerald Multi-Draw Credit Agreement Warrants - Black-Scholes option pricing model
Dec. 31, 2019
$ / shares
Nov. 01, 2018
$ / shares
Class of Warrant or Right [Line Items]    
Underlying common stock price   $ 0.36
Minimum    
Class of Warrant or Right [Line Items]    
Underlying common stock price $ 0.33  
Maximum    
Class of Warrant or Right [Line Items]    
Underlying common stock price $ 0.69  
Dividend yield    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding measurement input (in percent) 0.0000 0
Volatility factor    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding measurement input (in percent)   92.5
Volatility factor | Minimum    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding measurement input (in percent) 91.6  
Volatility factor | Maximum    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding measurement input (in percent) 0.921  
Risk-free interest rate    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding measurement input (in percent)   2.96
Risk-free interest rate | Minimum    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding measurement input (in percent) 0.0223  
Risk-free interest rate | Maximum    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding measurement input (in percent) 0.0251  
Expected term (years)    
Class of Warrant or Right [Line Items]    
Expected Term (years) 5 years 5 years