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Property, plant and equipment are summarized below: (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 2,295	$ 2,421
Less: Accumulated depreciation	(1,877)	(1,988)
Total property, plant and equipment, net	418	433
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,176	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	539	669
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	322	337
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 53

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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, 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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