Annual report pursuant to Section 13 and 15(d)

Warrants and Derivative Liabilities (Details 2)

v3.20.4
Warrants and Derivative Liabilities (Details 2) - Emerald Multi-Draw Credit Agreement Warrants - Black-Scholes option pricing model
Dec. 31, 2019
$ / shares
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
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) 92.1
Risk-free interest rate | Minimum  
Class of Warrant or Right [Line Items]  
Warrants and rights outstanding measurement input (in percent) 2.23
Risk-free interest rate | Maximum  
Class of Warrant or Right [Line Items]  
Warrants and rights outstanding measurement input (in percent) 2.51
Expected term (years)  
Class of Warrant or Right [Line Items]  
Expected Term 5 years