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

Warrants and Derivative Liabilities (Details 4)

v3.19.1
Warrants and Derivative Liabilities (Details 4) - Pricing Model - Series B Warrant Liability
Mar. 31, 2019
USD_per_warrants
Percent
Dec. 31, 2018
Dec. 31, 2018
USD_per_warrants
Dec. 31, 2018
Percent
Dec. 31, 2017
USD_per_warrants
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.69   0.4    
Expected Term         3 months
Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0   0.00 0 0.00
Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 92.1   93.00 93 70.00
Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 2.35       1.39
Risk-free interest rate | Minimum          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     2.786 2.786  
Risk-free interest rate | Maximum          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     2.789 2.789  
Expected term (years) | Minimum          
Class of Warrant or Right [Line Items]          
Expected Term 1 year 4 months 21 days 1 year 7 months 20 days      
Expected term (years) | Maximum          
Class of Warrant or Right [Line Items]          
Expected Term 1 year 4 months 28 days 1 year 7 months 24 days