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Business Segment and Geographic Information | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Business Segment and Geographic Information | 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 durable systems and disposable sensors through a direct sales force in the United States, Canada and some countries in Europe, and through distribution arrangements in the United States, Canada, Australia, New Zealand, and some countries in Europe, Asia, Latin America, the Middle East and Africa. 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, 2018, 2017 and 2016, 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,
| 2018 |  | 2017 |  | 2016
(Dollars in millions) | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Revenues: |  |  |  |  |  |  |  |  |  |  |
United States | $ | 818.4 |  |  | 79 | % |  | $ | 596.2 |  |  | 83 | % |  | $ | 497.5 |  |  | 87 | %
Outside of the United States | 213.2 |  |  | 21 | % |  | 122.3 |  |  | 17 | % |  | 75.8 |  |  | 13 | %
Total | $ | 1,031.6 |  |  | 100 | % |  | $ | 718.5 |  |  | 100 | % |  | $ | 573.3 |  |  | 100 | %
Substantially all 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, 2018, 2017 and 2016:
| Twelve Months Ended December 31,
| 2018 |  | 2017 |  | 2016
(Dollars in millions) | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Revenues: |  |  |  |  |  |  |  |  |  |  |
Distributor | $ | 652.9 |  |  | 63 | % |  | $ | 538.0 |  |  | 75 | % |  | $ | 411.8 |  |  | 72 | %
Direct | 378.7 |  |  | 37 | % |  | 180.5 |  |  | 25 | % |  | 161.5 |  |  | 28 | %
Total | $ | 1,031.6 |  |  | 100 | % |  | $ | 718.5 |  |  | 100 | % |  | $ | 573.3 |  |  | 100 | %

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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