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Property, plant and equipment are summarized below: (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 2,464	$ 2,421
Less: Accumulated depreciation	(1,948)	(1,988)
Total property, plant and equipment, net	516	433
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,396	1,210
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	205	205
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	541	669
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 322	$ 337

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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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