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NET LOSS PER SHARE - Computation of loss per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Net loss $ (6,341,699) $ (5,570,391) $ (12,827,343) $ (10,889,316)
Denominator:        
Weighted average common shares outstanding 46,572,739 45,501,078 46,328,561 45,483,513
Net loss per share data:        
Basic and diluted $ (0.14) $ (0.12) $ (0.28) $ (0.24)