Property and Equipment (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Property and equipment, gross	$ 4,238,000	$ 5,504,000
Accumulated depreciation and amortization	(4,163,000)	(4,955,000)
Property and equipment, net	75,000	549,000
Machinery And Equipment
Property and equipment, gross	2,349,000	3,685,000
Furniture And Fixtures
Property and equipment, gross	425,000	393,000
Computer Equipment and Software
Property and equipment, gross	1,447,000	1,426,000
Leasehold Improvements
Property and equipment, gross	0	0
Construction in Progress
Property and equipment, gross	$ 17,000	$ 0

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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