PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 14,670	$ 14,525
Less: Accumulated depreciation and amortization	(12,402)	(11,921)
Property, plant and equipment, net	2,268	2,604
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 285	285
Range of Asset Lives	7 - 36 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 906	906
Range of Asset Lives	2 - 5 years
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 12,439	12,343
Range of Asset Lives	2 - 30 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 907	907
Range of Asset Lives	2 - 8 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 133	$ 84