XML 61 R47.htm IDEA: XBRL DOCUMENT v3.20.4
Equity - Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity [Abstract]    
Risk-free interest rate 0.60% 2.30%
Expected term of options, in years 4 years 4 months 24 days 4 years 8 months 12 days
Expected annual volatility 115.20% 118.70%
Expected dividend yield 0.00% 0.00%
Determined weighted average grant date fair value per option $ 0.25 $ 0.25