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FAIR VALUE CONVERTIBLE PROMISSORY NOTES (Details 1) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Significant assumptions (weighted-average):    
Risk-free interest rate at grant date 0.36% 0.29%
Expected stock price volatility 81.14% 74.46%
Expected dividend payout $ 0  
Expected warrant life (in years) 2 years 3 years
Expected forfeiture rate 0.00%