RESTRUCTURING CHARGE - Schedule of changes in accrued restructuring charge (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 599	$ 702	$ 624	$ 727
Cash paid	(28)	(29)	(55)	(57)
Non-cash items	3	3	5	6
Balance, end of period	$ 574	$ 676	$ 574	$ 676