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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Property, Plant and Equipment, Net
Property, plant and equipment, gross	$ 2,420,000		$ 2,421,000
Less: accumulated depreciation	(2,131,000)		(2,108,000)
Total property, plant and equipment, net	289,000		313,000
Depreciation expense	40,000	$ 37,000
Furniture, machinery and equipment
Property, Plant and Equipment, Net
Property, plant and equipment, gross	2,014,000		2,009,000
Leasehold improvements
Property, Plant and Equipment, Net
Property, plant and equipment, gross	$ 406,000		$ 412,000

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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- Definition

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.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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