PROPERTY PLANT AND EQUIPMENT NET (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
PROPERTY PLANT AND EQUIPMENT NET
Leasehold improvements	$ 425	$ 421
Equipment	5,570	5,625
Sale demonstration equipment	802	963
Property and equipment gross	6,797	7,009
Less accumulated depreciation	5,826	5,793
Property and equipment, net	$ 971	$ 1,216

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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 before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office 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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