STOCK-BASED COMPENSATION EXPENSE - Schedule of Nonvested Share Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Options
Outstanding beginning balance (in shares)	25	125
Granted (in shares)	10	18
Vested (in shares)	(23)	(118)
Outstanding ending balance (in shares)	12	25
Weighted Average Grant-Date Fair Value
Grant Date Weighted-Average Fair Value, Outstanding (in dollars per share)	$ 1.40	$ 1.20
Grant Date Weighted-Average Fair Value, Granted (in dollars per share)	0.78	1.54
Weighted Average Grant-Date Fair Value, Nonvested, Vested (in dollars per share)	1.22	1.22
Grant Date Weighted-Average Fair Value, Outstanding (in dollars per share)	$ 1.07	$ 1.40