STOCKHOLDERS' EQUITY - Share-Based Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
STOCKHOLDERS' EQUITY
Stock-based compensation (income)/expense	$ 131,836	$ 420,990	$ 194,120	$ 1,427,931
Granted			1,070,500
Stock-based compensation options, expiration period			5 years
Vesting period			1 year
Fair value of awards, grant date			$ 616,675
Unrecognized compensation expense related to unvested Employee Awards	$ 241,412		$ 241,412
Recognition period related to unvested Employee Awards			11 months
Number of Shares
Outstanding, beginning of period			7,266,420
Granted			1,070,500
Exercised			(366,760)
Forfeited or expired			(1,902,800)
Outstanding, end of period	6,067,360		6,067,360		7,266,420
Exercisable, end of period	4,962,480		4,962,480
Weighted-average Exercise Price per Share
Outstanding, beginning of period			$ 1.03
Granted			0.87
Exercised			0.53
Forfeited or expired			0.81
Outstanding, end of period	$ 1.13		1.13		$ 1.03
Exercisable, end of period	$ 1.22		$ 1.22
Weighted-average Remaining Contractual Term (in years)
Outstanding contractual term (in years)			5 years 1 month 6 days		5 years 6 months
Exercisable, end of period			5 years 3 months 18 days
Aggregate Intrinsic Value
Outstanding, end of period	$ 81,000		$ 81,000		$ 167,000
Exercisable, end of period	$ 40,000		$ 40,000