PROPERTY PLANT AND EQUIPMENT NET (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
Leasehold improvements	$ 430	$ 421
Equipment	5,218	5,625
Sales demonstration equipment	754	963
Property and equipment gross	6,402	7,009
Less accumulated depreciation	5,456	5,793
Property and equipment, net	$ 946	$ 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 building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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