General form of registration statement for all companies including face-amount certificate companies

Warrants and Derivative Liabilities (Details 7)

v3.20.2
Warrants and Derivative Liabilities (Details 7) - Black-Scholes option pricing model - Series B Warrant Liability
Mar. 31, 2020
Percent
$ / shares
Dec. 31, 2019
Dec. 31, 2019
Percent
Dec. 31, 2019
$ / shares
Dec. 31, 2019
Dec. 31, 2018
$ / shares
Class of Warrant or Right [Line Items]            
Underlying common stock price $ 0.08     $ 0.13   $ 0.40
Dividend yield            
Class of Warrant or Right [Line Items]            
Warrants and rights outstanding measurement input (in percent) 0   0   0 0
Volatility factor            
Class of Warrant or Right [Line Items]            
Warrants and rights outstanding measurement input (in percent) 79.8   79.2   79.2 93.0
Risk-free interest rate            
Class of Warrant or Right [Line Items]            
Warrants and rights outstanding measurement input (in percent) 0.13   1.60   1.60 2.79
Expected term (years)            
Class of Warrant or Right [Line Items]            
Expected Term (years) 4 months 20 days 7 months 20 days        
Expected term (years) | Minimum            
Class of Warrant or Right [Line Items]            
Expected Term (years)           1 year 7 months 20 days
Expected term (years) | Maximum            
Class of Warrant or Right [Line Items]            
Expected Term (years)           1 year 7 months 24 days