STOCK BASED COMPENSATION - Schedule of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Outstanding, beginning (in shares)	3,460,750	3,180,417
Options granted (in shares)	1,150,000	697,000
Options exercised (in shares)	(112,500)	(7,500)
Options cancelled/forfeited/expired (in shares)	(80,000)	(409,167)
Outstanding, ending (in shares)	4,418,250	3,460,750	3,180,417
Vested (in shares)	2,383,625	2,127,500
Exercisable (in shares)	2,383,625	2,127,500
Weighted Average Exercise Price
Outstanding, beginning (in dollars per share)	$ 2.05	$ 2.21
Options granted (in dollars per share)	1.40	1.17
Options exercised (in dollars per share)	0.46	1.20
Options cancelled/forfeited/expired (in dollars per share)	0.46	1.80
Outstanding, ending (in dollars per share)	1.95	2.05	$ 2.21
Vested (in dollars per share)	2.50	2.48
Exercisable (in dollars per share)	$ 2.50	$ 2.48
Weighted Average Remaining Contractual Life (in Years)
Outstanding	6 years 3 months	3 years 6 months	4 years 7 months 13 days
Options granted	8 years 9 months 4 days	8 years 1 month 6 days
Vested	4 years 10 months 2 days	4 years 8 months 1 day
Exercisable	4 years 10 months 2 days	4 years 8 months 1 day
Grant Date Fair Value
Outstanding, beginning	$ 3,469,298	$ 3,298,196
Options granted	1,148,662	610,305
Options exercised	(41,789)	(4,241)
Options cancelled/forfeited/expired	(28,800)	(434,962)
Outstanding, ending	4,547,371	3,469,298	$ 3,298,196
Vested	2,625,779	2,122,478
Exercisable	$ 2,625,779	$ 2,122,478