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NET LOSS PER SHARE - Computation of loss per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net loss $ (10,906,782) $ (6,341,699) $ (19,686,232) $ (12,827,343)
Denominator:        
Weighted average common shares outstanding 83,030,470 46,572,739 69,823,729 46,328,561
Net loss per share:        
Basic and diluted $ (0.13) $ (0.14) $ (0.28) $ (0.28)