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Commitments and Contingencies Purchase Commitments (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Purchase commitments due within one year | $ 87.2
Purchase commitments maximum term | 1 year

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- Definition Recorded Unconditional Purchase Obligation Due Within One Year, Maximum Term + References No definition available. + Details
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Namespace Prefix: | dxcm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308 + Details
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Balance Type: | credit
Period Type: | instant