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GEOGRAPHIC AND SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
GEOGRAPHIC AND SEGMENT INFORMATION
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 March 31, 2017
 
Core
 
OEM
 
Advanced Energy
 
Corporate (Other)
 
Total
Sales
$
6,775

 
$
1,007

 
$
607

 
$
—

 
$
8,389

 
 
 
 
 
 
 
 
 
 
Income (loss) from operations
2,313

 
503

 
(1,721
)
 
(2,832
)
 
(1,737
)
 
 
 
 
 
 
 
 
 
 
Interest expense, net
—

 
—

 
—

 
(31
)
 
(31
)
Change in fair value of derivative liabilities, net
—

 
—

 
—

 
88

 
88

Income tax expense
—

 
—

 
—

 
5

 
5

Depreciation and amortization
—

 
—

 
—

 
178

 
178

 
Three Months Ended March 31, 2016
 
Core
 
OEM
 
Advanced Energy
 
Corporate (Other)
 
Total
Sales
$
6,478

 
$
941

 
$
356

 
$
—

 
$
7,775

 
 
 
 
 
 
 
 
 
 
Income (loss) from operations
1,122

 
657

 
(1,534
)
 
(2,238
)
 
(1,993
)
 
 
 
 
 
 
 
 
 
 
Interest expense, net
—

 
—

 
—

 
(38
)
 
(38
)
Change in fair value of derivative liabilities, net
—

 
—

 
—

 
87

 
87

Income tax expense
—

 
—

 
—

 
—

 
—

Depreciation and amortization
—

 
—

 
—

 
182

 
182



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 March 31,
(In thousands)
2017
 
2016
Sales by Product Line
 
 
 
Electrosurgical
$
5,330

 
$
4,252

Cauteries
1,655

 
1,834

Lighting
445

 
506

Other
959

 
1,183

Total
$
8,389

 
$
7,775



International sales during the three months ended March 31, 2017 and 2016 were 16.7% and 14.9% 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:
 
Three Months Ended March 31,
(In thousands)
2017
 
2016
Sales by Domestic and International
 
 
 
Domestic
$
6,992

 
$
6,615

International
1,397

 
1,160

Total
$
8,389

 
$
7,775