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. Asset information is not reviewed by the chief operating decision maker by segment and is not available by segment, accordingly, we have not presented a measure of assets by segment.

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. 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, 2019
(In thousands)	Advanced Energy			OEM		Corporate (Other)			Total
Sales	$	22,676		$	5,559	$	—		28,235

Income (loss) from operations	(8,045		)	2,136		(14,960		)	(20,869	)

Interest income	—			—		1,392			1,392
Interest expense	—			—		(8		)	(8	)
Other losses, net	—			—		(351		)	(351	)
Income tax benefit	—			—		130			130



	Year ended December 31, 2018 as Restated
(In thousands)	Advanced Energy			OEM		Corporate (Other)			Total
Sales	$	12,987		$	3,618	$	—		$	16,605

Income (loss) from operations	(6,326		)	1,795		(9,745		)	(14,276		)

Interest income	—			—		616			616
Interest expense	—			—		(104		)	(104		)
Other losses, net	—			—		(947		)	(947		)
Change in fair value of derivative liabilities	—			—		20			20
Income tax benefit	—			—		3,907			3,907



	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		)

Interest expense	—			—		(136		)	(136		)
Change in fair value of derivative liabilities	—			—		183			183
Income tax benefit	—			—		156			156

International sales in 2019, 2018 and 2017 were 30.6%, 22.6% and 13.2% 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)	2019		2018		2017
Sales by Domestic and International
Domestic	$	19,584	$	12,858	$	8,887
International	8,651		3,747		1,347
Total	$	28,235	$	16,605	$	10,234