RESTRUCTURING COSTS AND ACCRUALS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) position	Sep. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | position			24
Restructuring charges	$ (88)	$ 723	$ 1,001	$ 1,008
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment	100
Restructuring charges	700		1,000
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			3,687
New restructuring charges - operating expenses			838
Cash payments			(3,778)
Foreign exchange impact on ending balance			(24)
Accrual balance at end of period	$ 723		$ 723