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RESTRUCTURING COSTS AND ACCRUALS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 723	$ 229	$ 1,008	$ 518
Restructuring and Related Cost, Incurred Cost	723	202	1,008	478
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	723	229	1,008	518
Facilities-related accruals - current					$ 100
Facilities-related accruals - non-current					$ 200
Employee
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	700	200
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			155
New restructuring charges - operating expenses	723	202	911	473
Cash payments			(258)
Accrual balance at end of period	808		808
Facilities-related accruals - current	808		808
Facilities-related accruals - non-current	0		0
Facility
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	0	0	97	5
Other
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	$ 0	$ 27	$ 0	$ 40