Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Schedule of Stock-based Payment Award, Stock Options, Valuation Assumptions (Details)

v3.21.1
Stock Based Compensation - Schedule of Stock-based Payment Award, Stock Options, Valuation Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Expected life (years) 5 years 5 years
Risk-free interest 0.38% 1.62%
Expected volatility 89.76% 73.20%
Total grant date fair value   $ 3.45
Minimum [Member]    
Total grant date fair value $ 1.83  
Maximum [Member]    
Total grant date fair value $ 2.81