STOCK-BASED COMPENSATION - RSU activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
STOCK-BASED COMPENSATION
Number of Shares, Non-vested at beginning of period	469,000	453,334
Number of Shares, Granted RSUs	310,000	295,500
Number of Shares, Vested	(227,917)	(279,834)
Number of Shares, Non-vested at end of period	551,083	469,000
Weighted Average Fair Value at Grant Date, Non-vested at beginning of period	$ 3.43	$ 5.00
Weighted Average Fair Value at Grant Date, Granted RSUs	1.25	3.01
Weighted Average Fair Value at Grant Date, Vested	3.59	5.46
Weighted Average Fair Value at Grant Date, Non-vested at end of period	$ 2.14	$ 3.43