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RESTRUCTURING COSTS AND ACCRUALS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	$ 145	$ 558
Facilities-related accruals - current			$ 100
Facilities-related accruals - non-current			$ 200
Restructuring and Related Cost, Incurred Cost	145	540
Restructuring Charges	145	558
Employee-Related [Member]
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year	155
New restructuring charges - operating expenses	145	535
Cash payments	(110)
Accrual balance at end of period	190
Facilities-related accruals - current	190
Facilities-related accruals - non-current	0
Facilities-Related [Member]
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	0	5
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	0	18
2016 Plan [Member] \| Employee-Related [Member]
Restructuring accrual [Roll Forward]
Revisions of estimated liabilities	$ (100)	$ (600)