Details of Selected Balance Sheet Accounts - Property, Plant and Equipment (Details) - USD ($)	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment
Total	$ 184,923,000		$ 184,692,000
Less: accumulated depreciation	(137,143,000)		(134,951,000)
Less: impairment of long-lived assets	(36,553,000)		(36,553,000)
Property, plant and equipment, net	11,227,000		13,188,000
Depreciation expense including amortization under finance leases	2,800,000	$ 2,400,000
Impairment charge	0	$ 0
Buildings
Property, Plant and Equipment
Property plant and equipment gross	15,739,000		15,486,000
Machinery and equipment
Property, Plant and Equipment
Property plant and equipment gross	133,900,000		133,048,000
Seismic rental equipment
Property, Plant and Equipment
Seismic rental equipment	1,851,000		1,669,000
Furniture and fixtures
Property, Plant and Equipment
Property plant and equipment gross	3,164,000		3,347,000
Other
Property, Plant and Equipment
Property plant and equipment gross	$ 30,269,000		$ 31,142,000

Accumulated Impairment, Property, Plant, and Equipment

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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- Definition

Amount, before accumulated amortization, of right-of-use asset from finance lease.

+ References

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Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

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Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

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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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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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