STOCK BASED COMPENSATION - Schedule of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding, beginning (in shares)	5,104,288	4,418,250	3,460,750
Options granted (in shares)	1,321,240	686,038	1,150,000
Options exercised (in shares)	(2,041,610)	0	(112,500)
Options cancelled/forfeited/expired (in shares)	(188,750)	0	(80,000)
Outstanding, ending (in shares)	4,195,168	5,104,288	4,418,250	3,460,750
Vested (in shares)	1,716,400	3,096,000	2,383,625
Exercisable (in shares)	1,716,400	3,096,000	2,383,625
Weighted Average Exercise Price
Outstanding, beginning - weighted average exercise price (in dollars per share)	$ 1.80	$ 1.95	$ 2.05
Options granted - weighted average exercise price (in dollars per share)	1.93	0.81	1.40
Options exercised - weighted average exercise price (in dollars per share)	1.50	0	0.46
Options cancelled/forfeited/expired - weighted average exercise price (in dollars per share)	1.40	0	0.46
Outstanding, ending - weighted average exercise price (in dollars per share)	1.73	1.80	1.95	$ 2.05
Vested - weighted average exercise price (in dollars per share)	1.98	2.14	2.50
Exercisable - weighted average exercise price (in dollars per share)	$ 1.98	$ 2.14	$ 3
Weighted Average Remaining Contractual Life (in Years)
Outstanding - weighted average remaining contractual life	6 years 4 months 13 days	5 years 6 months 18 days	6 years 3 months	3 years 6 months
Options granted - weighted average remaining contractual life	9 years	7 years 6 months 3 days	8 years 9 months 3 days
Vested - weighted average remaining contractual life	3 years 11 months 8 days	4 years 5 months 15 days	4 years 10 months 2 days
Exercisable - weighted average remaining contractual life	3 years 11 months 8 days	4 years 5 months 15 days	4 years 10 months 2 days
Grant Date Fair Value
Outstanding, beginning - grant date fair value	$ 4,902,775	$ 4,547,371	$ 3,469,298
Options granted - grant date fair value	2,066,590	355,404	1,148,662
Options exercised - grant date fair value	(2,140,138)	0	(41,789)
Options cancelled/forfeited/expired - grant date fair value	(147,478)	0	(28,800)
Outstanding, ending - grant date fair value	4,681,749	4,902,775	4,547,371	$ 3,469,298
Vested - grant date fair value	1,707,422	3,110,775	2,625,779
Exercisable - grant date fair value	$ 1,707,422	$ 3,110,775	$ 2,625,779