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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Amount of increase (decrease) in accumulated depreciation, depletion and amortization of 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 of increase (decrease) of physical assets used in the normal conduct of business and not intended for resale, from reclassification, impairment, donation, or changes classified as other. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 49,298	$ 54,060
Less accumulated depreciation	(33,829)	(38,079)
Total property and equipment, net	15,469	15,981
Transfers of equipment between inventory and property and equipment, net	827	1,449	$ 1,637
Depreciation and amortization	3,600	4,200	$ 4,300
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	694	377
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,845	2,978
Building \| Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	10 years
Building \| Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	20 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 28,777	33,087
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	2 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	10 years
Office furniture & equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,345	1,687
Office furniture & equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	3 years
Office furniture & equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years
Computer hardware & software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,408	4,704
Computer hardware & software \| Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	3 years
Computer hardware & software \| Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	5 years
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,558	9,953
Leasehold and building improvements \| Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	5 years
Leasehold and building improvements \| Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	15 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 671	1,274
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	5 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years
Leased Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,100	10,800
Less accumulated depreciation	$ (4,600)	$ (6,100)