4. PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Total property, plant and equipment	$ 20,838	$ 21,157
Less: Accumulated depreciation and amortization	(11,510)	(11,466)
Property, plant and equipment,net	9,328	9,691
Buildings and improvements
Total property, plant and equipment	$ 285	285
Range of Asset lives	7-36 years
Leasehold Improvements
Total property, plant and equipment	$ 896	908
Range of Asset lives	2-5 years
Equipment
Total property, plant and equipment	$ 19,016	18,640
Range of Asset lives	2-30 years
Furniture, computers and office equipment
Total property, plant and equipment	$ 596	1,166
Range of Asset lives	2-8 years
Construction in Progress
Total property, plant and equipment	$ 45	$ 158

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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