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.

Prior to the first quarter of 2017, we disclosed only one reporting segment. Beginning in 2017, our reportable segments are disclosed as principally organized and managed as three operating segments: Core, OEM and Advanced Energy. We adopted reportable segments to align with changes in how we manage our business, review operating performance and allocate resources as a result of the growth in Advanced Energy and the differing behavior of the Core and OEM product lines. The Corporate & Other category includes unallocated corporate, operational, research and development and marketing 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 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 June 30, 2017
	Core		OEM		Advanced Energy			Corporate (Other)			Total
Sales	$	7,488	$	498	$	1,813		$	—		$	9,799

Income (loss) from operations	2,710		205		(1,250		)	(2,971		)	(1,306		)

Interest expense, net	—		—		—			(36		)	(36		)
Change in fair value of derivative liabilities	—		—		—			38			38
Income tax expense	—		—		—			4			4
Depreciation and amortization	—		—		—			178			178



	Three Months Ended June 30, 2016
	Core		OEM		Advanced Energy			Corporate (Other)			Total
Sales	$	6,881	$	1,648	$	766		$	—		$	9,295

Income (loss) from operations	1,836		1,151		(1,090		)	(2,407		)	(510		)

Interest expense, net	—		—		—			(50		)	(50		)
Change in fair value of derivative liabilities	—		—		—			41			41
Income tax expense	—		—		—			—			—
Depreciation and amortization	—		—		—			173			173



	Six Months Ended June 30, 2017
	Core		OEM		Advanced Energy			Corporate (Other)			Total
Sales	$	14,263	$	1,505	$	2,420		$	—		$	18,188

Income (loss) from operations	5,023		708		(2,971		)	(5,803		)	(3,043		)

Interest expense, net	—		—		—			(67		)	(67		)
Change in fair value of derivative liabilities	—		—		—			126			126
Income tax expense	—		—		—			9			9
Depreciation and amortization	—		—		—			356			356



	Six Months Ended June 30, 2016
	Core		OEM		Advanced Energy			Corporate (Other)			Total
Sales	$	13,359	$	2,589	$	1,122		$	—		$	17,070

Income (loss) from operations	2,958		1,808		(2,624		)	(4,645		)	(2,503		)

Interest expense, net	—		—		—			(88		)	(88		)
Change in fair value of derivative liabilities	—		—		—			128			128
Income tax expense	—		—		—			—			—
Depreciation and amortization	—		—		—			355			355

We derive revenues from four major product lines: Electrosurgical, Cauteries, Lighting and Other products. We do not review or analyze our four major product lines below net sales. Sales for the product lines are summarized as follows:



	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2017		2016		2017		2016
Sales by Product Line
Electrosurgical	$	6,206	$	5,078	$	11,536	$	9,330
Cauteries	1,873		1,720		3,528		3,554
Lighting	948		800		1,393		1,306
Other	772		1,697		1,731		2,880
Total	$	9,799	$	9,295	$	18,188	$	17,070

International sales represented approximately 11.1% and 13.7% of total revenues for the three and six months ended June 30, 2017, respectively, as compared with 16.6% and 15.9% of total revenues for the three and six months ended June 30, 2016. 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:



	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2017		2016		2017		2016
Sales by Domestic and International
Domestic	$	8,708	$	7,757	$	15,700	$	14,372
International	1,091		1,538		2,488		2,698
Total	$	9,799	$	9,295	$	18,188	$	17,070