RESTRUCTURING COSTS AND ACCRUALS (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) position	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Costs									$ 1,116	$ 5,046	$ 629
Restructuring and Related Cost, Incurred Cost									1,116	5,046	604
Other Restructuring Costs									0	0	25
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year				$ 3,687					3,687
Accrual balance at end of year	$ 655				$ 3,687				655	3,687
Restructuring charges	115	$ (88)	$ 15	1,074	4,038	$ 723	$ 140	$ 145	$ 1,116	5,046	629
Number of positions eliminated | position									24
Fixed asset write-off									$ 956	5,046	0
Accrual Adjustment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost									954	4,949	599
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year				3,687				155	3,687	155	2,859
Payments for Restructuring									(3,947)	(1,461)	(2,964)
Foreign exchange impact on ending balance									(39)	44	(21)
Accrual balance at end of year	655				3,687				655	3,687	155
Effectof842onRestructuring											(318)
Employee-Related [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs									1,116	4,949	599
Restructuring and Related Cost, Incurred Cost									954	4,949	599
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year				3,687				155	3,687	155	2,541
Payments for Restructuring									(3,947)	(1,461)	(2,964)
Foreign exchange impact on ending balance									(39)	44	(21)
Accrual balance at end of year	655				3,687				655	3,687	155
Facilities-Related [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs									0	97	5
Restructuring and Related Cost, Incurred Cost									0	0	0
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year				$ 0				$ 0	0	0	318
Payments for Restructuring									0	0	0
Foreign exchange impact on ending balance									0	0	0
Accrual balance at end of year	$ 0				$ 0				$ 0	$ 0	0
Effectof842onRestructuring											$ (318)
2016 Plan [Member] | Employee-Related [Member]
Restructuring accrual [Roll Forward]
Number of positions eliminated											54