Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)

v3.21.1
Stockholders' Equity - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dividend yield 0.00% 0.00%
Risk-free interest rate, minimum 0.19% 1.42%
Risk-free interest rate, maximum 0.50% 2.53%
Expected volatility, minimum 116.00% 105.20%
Expected volatility, maximum 117.00% 112.10%
Expected life (in years) 5 years  
Stock Appreciation Rights [Member]    
Dividend yield 0.00%  
Risk-free interest rate 0.22%  
Expected volatility 116.80%  
Expected life (in years) 5 years  
Minimum [Member]    
Expected life (in years)   5 years
Maximum [Member]    
Expected life (in years)   10 years