STOCKHOLDERS' EQUITY - Share-Based Compensation (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
STOCKHOLDERS' EQUITY
Stock-based compensation expense	$ 103,932	$ 572,574
Granted	895,500
Stock-based compensation options, expiration period	5 years
Vesting period	1 year
Fair value of awards, grant date	$ 561,237
Unrecognized compensation expense related to unvested Employee Awards	$ 803,599
Recognition period related to unvested Employee Awards	13 months
Number of Shares
Outstanding, beginning of period	7,266,420
Granted	895,500
Exercised	(213,860)
Forfeited or expired	(31,000)
Outstanding, end of period	7,917,060		7,266,420
Exercisable, end of period	5,340,940
Weighted-average Exercise Price per Share
Outstanding, beginning of period	$ 1.03
Granted	0.94
Exercised	0.63
Forfeited or expired	3.95
Outstanding, end of period	1.02		$ 1.03
Exercisable, end of period	$ 1.20
Weighted-average Remaining Contractual Term (in years)
Outstanding contractual term (in years)	5 years 3 months 18 days		5 years 6 months
Exercisable, end of period	5 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding, end of period	$ 1,614,000		$ 167,000
Exercisable, end of period	$ 868,000