Industry Segments (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Geographic information for the periods

Geographic information for the periods presented was as follows (in thousands):

	United States		Canada		Mexico		Total
Year Ended December 31, 2017
Revenue	$	63,782	$	25,456	$	1,012	$	90,250
Assets (1)	61,690		13,597		854		76,141
Year Ended December 31, 2016
Revenue	$	75,353	$	17,790	$	1,403	$	94,546
Assets (1)	99,339		18,028		264		117,631
Year Ended December 31, 2015
Revenue	$	74,592	$	25,660	$	—	$	100,252
Assets (1)	132,264		31,586		116		163,966

(1)Assets include net seismic data library and net property and equipment.

Revenue by type of service for the periods

Revenue by type of service for the periods presented was as follows (in thousands):

	Year Ended December 31,
	2017		2016		2015
Acquisition and licensing of seismic data	$	88,158	$	92,454	$	97,938
Reproduction and delivery of seismic data and other services	2,092		2,092		2,314
Total revenue	$	90,250	$	94,546	$	100,252