20. Segment and Geographic Information

The Company reports and evaluates financial information for two segments: Seismic and Non-Seismic. Seismic product lines include wireless data acquisition systems, reservoir characterization products and services, and traditional exploration products such as geophones, hydrophones, leader wire, connectors, cables, marine streamer retrieval and steering devices and various other products. The Non-Seismic product lines include imaging products and industrial products.

The following tables summarize the Company’s segment information:

	YEAR ENDED SEPTEMBER 30,
	2017			2016			2015
Revenue:
Seismic	$	47,109		$	33,792		$	60,565
Non-seismic		26,027			27,708			23,758
Corporate		585			560			544
Total		73,721			62,060			84,867
Income (loss) from operations:
Seismic		(46,902	)		(47,690	)		(42,732	)
Non-seismic		4,153			4,093			3,031
Corporate		(11,574	)		(11,913	)		(12,854	)
Total		(54,323	)		(55,510	)		(52,555	)
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses:
Seismic		47,620			34,945			23,696
Non-seismic		785			746			505
Corporate		1,895			1,847			1,728
Total		50,300			37,538			25,929
Interest income:
Seismic		311			161			280
Non-seismic		—			3			7
Corporate		342			212			140
Total		653			376			427
Interest expense:
Seismic		—			—			—
Non-seismic		—			—			—
Corporate		39			26			229
Total		39			26			229

The Company’s manufacturing operations for its Seismic and Non-Seismic business segments are combined. Therefore, the Company does not segregate and report separate balance sheet accounts for these segments. As a result, the Company has not presented business segment balance sheet information 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 and rentals 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,
	2017			2016			2015
United States	$	60,696		$	56,094		$	77,487
Canada		12,157			3,028			4,796
Colombia		558			556			609
Russian Federation		2,566			4,254			5,554
United Kingdom		2,892			2,120			2,644
Eliminations		(5,148	)		(3,992	)		(6,223	)
	$	73,721		$	62,060		$	84,867

A summary of revenue by geographic area for fiscal years 2017, 2016 and 2015 is as follows (in thousands):

	YEAR ENDED SEPTEMBER 30,
	2017		2016		2015
Asia (excluding Middle East)	$	7,924	$	18,745	$	8,755
Canada		11,318		3,048		2,298
Europe		3,883		4,219		13,672
Middle East		609		1,749		2,024
United States		47,966		32,317		50,101
Other		2,021		1,982		8,017
	$	73,721	$	62,060	$	84,867

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 were as follows (in thousands):

	AS OF SEPTEMBER 30,
	2017		2016		2015
			(Restated)		(Restated)
United States	$	108,021	$	136,617	$	162,548
Canada		7,325		11,911		19,323
Colombia		1,747		3,487		9,227
Russian Federation		1,461		1,498		1,215
United Kingdom		502		391		502
China		14		14		14
	$	119,070	$	153,918	$	192,829