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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No definition available.

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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, plant and equipment, net
Property, plant and equipment, gross	$ 2,109		$ 2,109		$ 2,200
Less: accumulated depreciation	(1,737)		(1,737)		(1,793)
Total property, plant and equipment, net	372		372		407
Depreciation expense	51	$ 55	163	$ 173
Furniture, machinery and equipment
Property, plant and equipment, net
Property, plant and equipment, gross	1,680		1,680		1,662
Leasehold improvements
Property, plant and equipment, net
Property, plant and equipment, gross	$ 429		$ 429		$ 538