Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Other Benefit Plans (Stock Option Valuation Assumptions) (Details)

v3.20.1
Stock-Based Compensation and Other Benefit Plans (Stock Option Valuation Assumptions) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation of the options granted      
Expected life in years 3 years 2 months 12 days 3 years 6 months 3 years 2 months 12 days
Average expected volatility 73.00% 71.00% 73.00%
Risk-free interest rate 2.33% 2.51% 1.51%
Weighted average grant date fair value - ($/share) $ 1.06 $ 0.68 $ 0.49