NET LOSS PER SHARE - Computation of loss per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net loss	$ (7,371,500)	$ (5,459,486)	$ (20,198,843)	$ (16,348,802)
Denominator:
Weighted average common shares outstanding	46,867,119	45,655,387	46,509,391	45,541,434
Net loss per share data:
Basic and diluted	$ (0.16)	$ (0.12)	$ (0.43)	$ (0.36)