STOCK-BASED COMPENSATION EXPENSE - Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units
Vested (in shares)	(103,000)
Grant Date Weighted- Average Fair Value
Grant Date Weighted-Average Fair Value, Granted (in dollars per share)	$ 0.78	$ 1.54
Restricted Stock Units (RSUs)
Restricted Stock Units
Outstanding beginning balance (in shares)	3,000	4,000
Granted (in shares)	144,000	36,000
Vested (in shares)	(134,000)	(37,000)
Outstanding ending balance (in shares)	13,000	3,000
Grant Date Weighted- Average Fair Value
Grant Date Weighted-Average Fair Value, Outstanding (in dollars per share)	$ 3.03	$ 2.68
Grant Date Weighted-Average Fair Value, Granted (in dollars per share)	1.96	2.50
Grant Date Weighted-Average Fair Value, Vested (in dollars per share)	1.98	2.47
Grant Date Weighted-Average Fair Value, Outstanding (in dollars per share)	1.97	3.03
Intrinsic Value
Intrinsic Value, Outstanding (in dollars per share)	0	0
Intrinsic Value, Granted (in dollars per share)	0	0
Intrinsic Value, Vested (in dollars per share)	0	0
Intrinsic Value, Outstanding (in dollars per share)	$ 2,000	$ 0