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WARRANT LIABILITY (Details 3) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Weighted average assumptions:    
Risk-free interest rate 0.52% 0.20%
Expected dividend yield 0.00% 0.00%
Expected option life (years) 1 year 11 months 29 days 2 years 8 months 23 days
Expected stock price volatility 86.88% 73.93%
Weighted average fair value $ 0.39 $ 0.77