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RESTRUCTURING COSTS AND ACCRUALS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 540	$ 2,858	$ 540
Other Restructuring Costs	18	49
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	558	2,907
Accretion			4
Cash payments			(1,437)
Foreign exchange impact on ending balance			(11)
Facilities-related accruals - current	1,796
Facilities-related accruals - non-current	159			$ 188
Restructuring Charges	558	2,907
Employee Severance [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	2,541		2,541
New restructuring charges - operating expenses	535	168	535
Accretion			0
Cash payments			(1,398)
Foreign exchange impact on ending balance			(12)
Accrual balance at end of period	1,666
Facilities-related accruals - current	1,666
Facilities-related accruals - non-current	0
Employee Severance [Member] \| Acquisition-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	2,859		2,859
Accrual balance at end of period	1,955
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	318		318
New restructuring charges - operating expenses	5	2,690	5
Revisions of estimated liabilities		2,700
Accretion			4
Cash payments			(39)
Foreign exchange impact on ending balance			$ 1
Accrual balance at end of period	289
Facilities-related accruals - current	130
Facilities-related accruals - non-current	159
2016 Plan [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges	600	2,900
2016 Plan [Member] \| Employee Severance [Member]
Restructuring accrual [Roll Forward]
Restructuring Charges		$ 200
Accrued Expenses and Other Current Liabilities [Member] \| Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Facilities-related accruals - current	100
Other Noncurrent Liabilities [Member] \| Facilities-Related [Member]
Restructuring accrual [Roll Forward]
Facilities-related accruals - non-current	$ 200