GEOGRAPHIC AND SEGMENT INFORMATION

Operating segments are aggregated into reportable segments only if they exhibit similar economic characteristics. In addition to similar economic characteristics, we also consider the following factors in determining the reportable segments: the nature of business activities, the management structure directly accountable to our chief operating decision maker for operating and administrative activities, availability of discrete financial information and information presented to the Board of Directors and investors.

Our reportable segments are disclosed as principally organized and managed as two operating segments: Advanced Energy and OEM. "Corporate & Other" includes certain unallocated corporate and administrative costs which were not specifically attributed to any reportable segment. Net assets are shared, therefore, not allocated to the reportable segments. The OEM segment is primarily development and manufacturing contract and product driven, all related expenses are recorded as cost of sales, therefore no segment specific operating expenses are incurred.

Summarized financial information with respect to reportable segments is as follows:



	Year ended December 31, 2018
(In thousands)	Advanced Energy			OEM		Corporate (Other)			Total
Sales	$	13,068		$	3,618	$	—		16,686

Income (loss) from operations	(6,326		)	1,795		(9,069		)	(13,600	)

Severance and related expense	—			—		741			741
Interest income	—			—		616			616
Interest expense	—			—		(104		)	(104	)
Income tax benefit	—			—		(3,777		)	(3,777	)



	Year ended December 31, 2017
(In thousands)	Advanced Energy			OEM		Corporate (Other)			Total
Sales	$	7,636		$	2,598	$	—		$	10,234

Income (loss) from operations	(3,957		)	1,353		(11,281		)	(13,885		)

Severance and related expense	—			—		1,524			1,524
Interest income	—			—		—			—
Interest expense	—			—		(136		)	(136		)
Income tax benefit	—			—		(156		)	(156		)



	Year ended December 31, 2016
(In thousands)	Advanced Energy			OEM		Corporate (Other)			Total
Sales	$	3,491		$	5,328	$	—		$	8,819

Income (loss) from operations	(4,812		)	3,045		(9,625		)	(11,392		)

Severance and related expense	—			—		—			—
Interest income	—			—		—			—
Interest expense	—			—		(158		)	(158		)
Income tax expense	—			—		64			64

International sales in 2018, 2017 and 2016 were 22.9%, 13.2% and 3.9% of sales, respectively. Substantially all of these sales are denominated in U.S. dollars. Revenue by geographic region, based on the "ship to" location on the invoice are as follows:



	Year Ended December 31,
(In thousands)	2018		2017		2016
Sales by Domestic and International
Domestic	$	12,858	$	8,887	8,475
International	3,828		1,347		344
Total	$	16,686	$	10,234	$	8,819