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RESTRUCTURING COSTS AND ACCRUALS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	$ 229	$ 226	$ 518	$ 3,401
Facilities-related accruals - non-current	125		125		$ 188
Restructuring and Related Cost, Incurred Cost	202	(16)	478	1,911
Restructuring Charges	229	226	518	3,401
Employee-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			2,541
New restructuring charges - operating expenses	202	879	473	1,734
Accretion			0
Cash payments			(2,702)
Foreign exchange impact on ending balance			(22)
Accrual balance at end of period	290		290
Facilities-related accruals - current	290		290
Facilities-related accruals - non-current	0		0
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			318
New restructuring charges - operating expenses	0	(895)	5	177
Accretion			14
Cash payments			(118)
Foreign exchange impact on ending balance			1
Accrual balance at end of period	220		220
Facilities-related accruals - current	95		95
Facilities-related accruals - non-current	125		125
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	27	242	40	1,490
Accrual Adjustment [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			2,859
New restructuring charges - operating expenses			478
Accretion			14
Cash payments			(2,820)
Foreign exchange impact on ending balance			(21)
Accrual balance at end of period	510		510
Facilities-related accruals - current	385		385
Facilities-related accruals - non-current	125		125
2016 Plan [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges		$ 200		3,400
2016 Plan [Member] \| Employee-Related [Member]
Restructuring accrual [Roll Forward]
Revisions of estimated liabilities	(200)		(500)
Restructuring Charges				1,700
2016 Plan [Member] \| Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges				200
2016 Plan [Member] \| Property, Plant and Equipment [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges				$ 1,100
Accrued Expenses and Other Current Liabilities [Member] \| Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Facilities-related accruals - current	100		100
Other Noncurrent Liabilities [Member] \| Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Facilities-related accruals - non-current	$ 100		$ 100