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PROPERTY PLANT AND EQUIPMENT NET (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
PROPERTY PLANT AND EQUIPMENT NET
Leasehold improvements	$ 425	$ 421
Equipment	5,637	5,625
Sale demonstration equipment	767	963
Property and equipment gross	6,829	7,009
Less accumulated depreciation	5,889	5,793
Property and equipment, net	$ 940	$ 1,216

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