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Commitments Commitments - Purchase Commitments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Purchase obligations | $ 204.0
Term of purchase obligations | 1 year

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- Definition Recorded Unconditional Purchase Obligation Due Within One Year, Maximum Term + References No definition available. + Details
Name: | dxcm_RecordedUnconditionalPurchaseObligationDueWithinOneYearMaximumTerm
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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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://fasb.org/us-gaap/role/ref/legacyRef -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
Name: | us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant