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Business Segment and Geographic Information
 12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Business Segment and Geographic Information
10. Business Segment and Geographic Information
Reportable Segments
An operating segment is identified as a component of a business that has discrete financial information available and for which the chief operating decision maker must decide the level of resource allocation. In addition, the guidance for segment reporting indicates certain quantitative materiality thresholds. None of the components of our business meet the definition of an operating segment.
We currently consider our operations to be, and manage our business globally within, one reportable segment, which is consistent with how our President and Chief Executive Officer, who is our chief operating decision maker, reviews our business, makes investment and resource allocation decisions, and assesses operating performance.
Disaggregation of Revenue
DexCom is domiciled in the United States. We sell our CGM systems through a direct sales force in the United States, Canada and some countries in Europe, and through distribution arrangements in the United States, and certain countries in Africa, Asia, Europe, Latin America, and the Middle East, as well as Australia, Canada, and New Zealand. We disaggregate our revenue from contracts by geography and by major sales channel as we believe they best depict how the nature, amount and timing of revenues and cash flows are affected by economic factors.
Revenues by geographic region
During the twelve months ended December 31, 2019, 2018 and 2017, no individual country outside the United States generated revenue that represented more than 10% of our total revenue. The following table sets forth revenues by our two primary geographical markets, the United States and outside of the United States, based on the geographic location to which we deliver the product:
 
Twelve Months Ended December 31,
 
2019
 
2018
 
2017
(Dollars in millions)
Amount
 
%
of Total
 
Amount
 
%
of Total
 
Amount
 
%
of Total
Revenues:
 
 
 
 
 
 
 
 
 
 
 
United States
$
1,161.5

 
79
%
 
$
818.4

 
79
%
 
$
596.2

 
83
%
Outside of the United States
314.5

 
21
%
 
213.2

 
21
%
 
122.3

 
17
%
Total
$
1,476.0

 
100
%
 
$
1,031.6

 
100
%
 
$
718.5

 
100
%

The majority of our long-lived assets are located in the United States.
Revenues by customer sales channel
The following table sets forth revenues by major sales channel for the twelve months ended December 31, 2019, 2018 and 2017:
 
Twelve Months Ended December 31,
 
2019
 
2018
 
2017
(Dollars in millions)
Amount
 
%
of Total
 
Amount
 
%
of Total
 
Amount
 
%
of Total
Revenues:
 
 
 
 
 
 
 
 
 
 
 
Distributor
$
1,011.6

 
69
%
 
$
652.9

 
63
%
 
$
538.0

 
75
%
Direct
464.4

 
31
%
 
378.7

 
37
%
 
180.5

 
25
%
Total
$
1,476.0

 
100
%
 
$
1,031.6

 
100
%
 
$
718.5

 
100
%