Details of Selected Balance Sheet Accounts (Tables)

9 Months Ended

Sep. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of inventories

A summary of inventories follows (in thousands):	September 30, 2019			December 31, 2018
Raw materials and subassemblies	$	18,269		$	20,011
Work-in-process	2,460			1,032
Finished goods	5,166			8,111
Reserve for excess and obsolete inventories	(12,961		)	(15,024		)
Inventories, net	$	12,934		$	14,130

Summary of property, plant, equipment and seismic rental equipment

A summary of property, plant and equipment follows (in thousands):	September 30, 2019			December 31, 2018
Buildings	$	15,714		$	15,707
Machinery and equipment	133,257			132,135
Seismic rental equipment	1,572			1,423
Furniture and fixtures	3,867			3,859
Other	30,560			30,104
Total	184,970			183,228
Less accumulated depreciation	(135,514		)	(133,634		)
Less impairment of long-lived assets	(36,553		)	(36,553		)
Property, plant and equipment, net	$	12,903		$	13,041

Schedule of multi-client data library

The change in multi-client data library are as follows (in thousands):	September 30, 2019			December 31, 2018
Gross costs of multi-client data creation	$	998,275		$	972,309
Less accumulated amortization	(806,647		)	(776,860		)
Less impairments to multi-client data library	(121,905		)	(121,905		)
Multi-client data library, net	$	69,723		$	73,544