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STOCKHOLDERS' EQUITY (DEFICIT) & STOCK-BASED COMPENSATION (Details 3) - Equity Option [Member] - USD ($)
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Summary of Investment Holdings [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,751,437 3,591,755
Weighted Average Remaining Contractual Life, Option Outstanding 8 years 1 month 2 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 1.86 $ 1.75
Options Exercisable 2,420,577  
Weighted Average Exercise Price, Exercisable $ 1.47  
Average Intrinsic Value, Exercisable $ 10,761,492  
Minimum [Member]    
Summary of Investment Holdings [Line Items]    
Exercise Price, Maximum Value $ 0.66  
Maximum [Member]    
Summary of Investment Holdings [Line Items]    
Exercise Price, Maximum Value $ 5.90