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:




	Three Months Ended September 30, 2019
(In thousands)	Advanced Energy			OEM		Corporate & Other			Total
Sales	$	6,094		$	1,481	$	—		$	7,575

Income (loss) from continuing operations	(1,357		)	268		(3,608		)	(4,697		)

Interest income	—			—		327			327
Other income, net	—			—		230			230
Income tax expense	—			—		(171		)	(171		)




	Three Months Ended September 30, 2018
(In thousands)	Advanced Energy			OEM		Corporate & Other			Total
Sales	$	2,985		$	687	$	—		$	3,672

Income (loss) from continuing operations	(1,155		)	368		(2,009		)	(2,796		)

Interest income, net	—			—		105			105
Income tax benefit	—			—		2,408			2,408



	Nine Months Ended September 30, 2019
(In thousands)	Advanced Energy			OEM		Corporate & Other			Total
Sales	$	15,734		$	4,038	$	—		$	19,772

Income (loss) from continuing operations	(5,756		)	995		(10,174		)	(14,935		)

Interest income	—			—		1,153			1,153
Other income, net	—			—		5			5
Income tax expense	—			—		(123		)	(123		)



	Nine Months Ended September 30, 2018
(In thousands)	Advanced Energy			OEM		Corporate & Other			Total
Sales	$	8,727		$	2,033	$	—		$	10,760

Income (loss) from continuing operations	(2,525		)	1,076		(7,000		)	(8,449		)

Interest income, net	—			—		33			33
Change in value of derivative liabilities	—			—		20			20
Income tax benefit	—			—		2,384			2,384

International sales represented approximately 26.7% of total revenues for the three months ended September 30, 2019, as compared with 24.8% of total revenues for the same prior year period. International sales represented approximately 29.2% of total revenues for the nine months ended September 30, 2019, as compared with 21.2% of total revenues for the same prior year period.

Substantially all of these sales are denominated in U.S. dollars. Revenue by geographic region, based on the customer's “ship to” location on the invoice, are as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2019		2018		2019		2018
Sales by Domestic and International
Domestic	$	5,552	$	2,763	$	14,002	$	8,481
International	2,023		909		5,770		2,279
Total	$	7,575	$	3,672	$	19,772	$	10,760