3. PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 21,157	$ 23,498
Less: Accumulated depreciation and amortization	(11,466)	(11,146)
Property, plant and equipment, net	9,691	12,352
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 285	285
Range of Asset Lives	7 to 36 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 908	908
Range of Asset Lives	2 to 5 years
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 18,640	19,012
Range of Asset Lives	2 to 30 years
Furniture, computers and office equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,166	1,166
Range of Asset Lives	2 to 8 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 158	$ 2,127