XML 63 R52.htm IDEA: XBRL DOCUMENT v3.20.2
Stock Options (Details1) - Employee Stock Option [Member] - $ / shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price $ 2.58 $ 0.85
Expected life 5 years 6 years 9 months 18 days
Expected volatility 71.00% 63.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate 1.23% 2.40%