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Property and Equipment, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment - gross	$ 122,285	$ 122,142
Less accumulated depreciation	(95,768)	(95,364)
Total property and equipment, net	26,517	26,778
Land
Property Plant And Equipment [Line Items]
Property and equipment - gross	875	875
Buildings
Property Plant And Equipment [Line Items]
Property and equipment - gross	$ 17,389	17,389
Buildings | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	39 years
Buildings | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	40 years
Building Improvements
Property Plant And Equipment [Line Items]
Property and equipment - gross	$ 37,543	37,543
Building Improvements | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	5 years
Building Improvements | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	40 years
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment - gross	$ 54,978	54,982
Machinery and Equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	3 years
Machinery and Equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	15 years
Furniture, fixtures and office equipment
Property Plant And Equipment [Line Items]
Property and equipment - gross	$ 3,005	3,005
Furniture, fixtures and office equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	5 years
Furniture, fixtures and office equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life (Years)	10 years
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment - gross	$ 8,319	8,234
Estimated Useful Life (Years)	3 years
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment - gross	$ 176	$ 114

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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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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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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