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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 6,183	$ 6,064
Accumulated depreciation	(4,803)	(4,713)
Property, plant and equipment, net	1,380	1,351
Buildings and Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,222	1,109
Enterprise Hardware and Software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,860	1,862
Property, plant and equipment, estimated useful life	3 years
Leaseholds [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,804	1,826
Property, plant and equipment, estimated useful life	Lesser of lease term or estimated useful life
Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,094	1,063
Property, plant and equipment, estimated useful life	7 years
Furniture [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 203	$ 204
Property, plant and equipment, estimated useful life	5 years
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life	30 years

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

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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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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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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