Details of Selected Balance Sheet Accounts - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	$ 184,590		$ 183,228
Less accumulated depreciation	(134,923)		(133,634)
Less impairment of long-lived assets	(36,553)		(36,553)
Property, plant and equipment, net	13,114		13,041
Depreciation expense including amortization under finance leases	1,600	$ 4,200
Buildings
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	15,756		15,707
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	133,372		132,135
Seismic rental equipment
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	1,157		1,423
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	3,878		3,859
Other
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	$ 30,427		$ 30,104

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 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.

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