22. Segment and Geographic Information

Effective September 30, 2018, the Company began reporting and evaluating financial information for three operating business segments: Oil and Gas Markets, Adjacent Markets and Emerging Markets. The Oil and Gas Markets segment was previously referred to as our Seismic segment. This segment’s products include wireless seismic data acquisition systems, reservoir characterization products and services, and traditional seismic exploration products such as geophones, hydrophones, leader wire, connectors, cables, marine streamer retrieval and steering devices and various other seismic products. Our Adjacent Markets segment was previously referred to as our Non-Seismic segment. This segment’s products include imaging equipment, water meter products, offshore cables, as well as seismic sensors used for vibration monitoring and geotechnical applications such as mine safety applications and earthquake detection. The Emerging Markets segment was added in conjunction with the acquisition of Quantum, which designs and markets seismic products targeted at the border and perimeter security markets.

The following tables summarize the Company’s segment information:

	YEAR ENDED SEPTEMBER 30,
	2018			2017			2016
Revenue:
Oil and Gas Markets	$	44,951		$	47,109		$	33,792
Adjacent Markets		29,932			26,027			27,708
Emerging Markets		286			—			—
Corporate		579			585			560
Total		75,748			73,721			62,060
Income (loss) from operations:
Oil and Gas Markets		(14,070	)		(46,902	)		(47,690	)
Adjacent Markets		5,345			4,153			4,093
Emerging Markets		(718	)		—			—
Corporate		(11,300	)		(11,574	)		(11,913	)
Total		(20,743	)		(54,323	)		(55,510	)
Depreciation, amortization, impairment, inventory obsolescence and stock-based compensation expenses:
Oil and Gas Markets		19,592			47,620			34,945
Adjacent Markets		654			785			746
Emerging Markets		207			—			—
Corporate		1,203			1,895			1,847
Total		21,656			50,300			37,538
Interest income:
Oil and Gas Markets		614			311			161
Adjacent Markets		—			—			3
Emerging Markets		—			—			—
Corporate		469			342			212
Total		1,083			653			376
Interest expense:
Oil and Gas Markets		2			—			—
Adjacent Markets		—			—			—
Emerging Markets		1			—			—
Corporate		333			39			26
Total		336			39			26

The Company’s manufacturing operations for its business segments are combined. Therefore, the Company does not segregate and report separate balance sheet accounts for each of its segments and, therefore, no such segment balance sheet information is presented in the table above.

“Corporate” revenue consists of rental revenue earned from an operating lease of a surplus building located in Houston, Texas. “Corporate” loss from operations primarily consists of the Company’s Houston headquarter general and administrative expenses.

The Company generates revenue from product sales, rentals and services from its subsidiaries located in the United States, Canada, Colombia, the Russian Federation and the United Kingdom. Revenue information for the Company is as follows (in thousands):

	YEAR ENDED SEPTEMBER 30,
	2018			2017			2016
United States	$	79,019		$	60,696		$	56,094
Canada		8,311			12,157			3,028
Colombia		300			558			556
Russian Federation		3,539			2,566			4,254
United Kingdom		3,095			2,892			2,120
Eliminations		(18,516	)		(5,148	)		(3,992	)
	$	75,748		$	73,721		$	62,060

A summary of revenue by geographic area is as follows (in thousands):

	YEAR ENDED SEPTEMBER 30,
	2018		2017		2016
Asia (excluding Middle East)	$	2,143	$	7,924	$	18,745
Canada		15,945		11,318		3,048
Europe		4,743		3,883		4,219
Middle East		76		609		1,749
United States		50,522		47,966		32,317
Other		2,319		2,021		1,982
	$	75,748	$	73,721	$	62,060

Revenue is attributed to countries based on the ultimate destination of the product sold, if known. If the ultimate destination is not known, revenue is attributed to countries based on the geographic location of the initial shipment.

Long-lived assets, excluding deferred tax assets, were as follows (in thousands):

	AS OF SEPTEMBER 30,
	2018		2017
United States	$	106,079	$	108,021
Canada		13,515		7,325
Colombia		1,002		1,747
Russian Federation		1,143		1,461
United Kingdom		428		502
China		13		14
	$	122,180	$	119,070