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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, plant and equipment, net
Property, plant and equipment, gross	$ 2,147		$ 2,140
Less: accumulated depreciation	(1,857)		(1,802)
Total property, plant and equipment, net	290		338
Depreciation expense	52	$ 54
Furniture, machinery and equipment
Property, plant and equipment, net
Property, plant and equipment, gross	1,702		1,696
Leasehold improvements
Property, plant and equipment, net
Property, plant and equipment, gross	$ 445		$ 444

X

- Definition

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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- 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.

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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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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.

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