PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 12,695	$ 13,558
Less: Accumulated depreciation and amortization	(10,828)	(11,831)
Property, plant and equipment, net	1,867	1,727
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	$ 899	899
Range of Asset Lives	2 - 5 years
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 10,855	11,885
Range of Asset Lives	2 - 30 year
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 391	429
Range of Asset Lives	2 - 8 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 265	$ 60