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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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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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.

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Details of Certain Financial Statement Components - Property, plant and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Property, plant and equipment, net
Property, plant and equipment, gross	$ 2,052		$ 2,052		$ 2,140
Less: accumulated depreciation	(1,856)		(1,856)		(1,802)
Total property, plant and equipment, net	196		196		338
Depreciation expense	48	$ 51	150	$ 163
Furniture, machinery and equipment
Property, plant and equipment, net
Property, plant and equipment, gross	1,643		1,643		1,696
Leasehold improvements
Property, plant and equipment, net
Property, plant and equipment, gross	$ 409		$ 409		$ 444