STOCKHOLDERS' EQUITY - Share-Based Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
STOCKHOLDERS' EQUITY
Stock-based compensation expense	$ 420,990	$ 768,079	$ 1,427,931	$ 3,013,042
Unrecognized compensation expense related to unvested Employee Awards	$ 115,866		$ 115,866
Recognition period related to unvested Employee Awards			15 months
Number of Shares
Outstanding, beginning of period			10,883,780
Granted			1,902,020
Forfeited or expired			(3,189,161)
Outstanding, end of period	9,596,639		9,596,639		10,883,780
Exercisable, end of period	7,427,999		7,427,999
Weighted-average Exercise Price per Share
Outstanding, beginning of period			$ 1.28
Granted			0.47
Forfeited or expired			1.47
Outstanding, end of period	$ 1.06		1.06		$ 1.28
Exercisable, end of period	$ 1.25		$ 1.25
Weighted-average Remaining Contractual Term (in years)
Outstanding contractual term (in years)			5 years 6 months		5 years 4 months 24 days
Exercisable, end of period			5 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding, end of period					$ 61,000