RESTRUCTURING COSTS AND ACCRUALS (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 140,000	$ (269,000)	$ 285,000	$ 289,000
Restructuring and Related Cost, Incurred Cost	140,000	(269,000)	285,000	271,000
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	140,000	(269,000)	285,000	289,000
Facilities-related accruals - current					$ 100,000
Facilities-related accruals - non-current					$ 200,000
Employee
Restructuring accrual [Roll Forward]
Accrual balance at beginning of year			155,000
New restructuring charges - operating expenses	43,000	(269,000)	188,000	266,000
Cash payments			(220,000)
Accrual balance at end of period	123,000		123,000
Facilities-related accruals - current	123,000		123,000
Facilities-related accruals - non-current	0		0
Facility
Restructuring accrual [Roll Forward]
New restructuring charges - operating expenses	97,000	0	97,000	5,000
Other
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	0	0	0	$ 18,000
2016 Plan [Member] | Employee
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 200,000	300,000	$ 300,000
Restructuring Reserve, Accrual Adjustment		$ 600,000