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Commitments and Contingencies - Rental Obligations (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Oct. 01, 2014
sqft
Apr. 01, 2015
sqft
Potential Rental Rate Adjustment Minimum 2.50%dxcm_PotentialRentalRateAdjustmentMinimum      
Potential Rental Rate Adjustment Maximum 4.00%dxcm_PotentialRentalRateAdjustmentMaximum      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 3 years      
Operating Leases, Rent Expense, Net $ 1.3us-gaap_OperatingLeasesRentExpenseNet $ 0.7us-gaap_OperatingLeasesRentExpenseNet    
Operating Leases, Future Minimum Payments Due, Remainder of 2015 2.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent      
Operating Leases, Future Minimum Payments, 2016 3.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears      
Operating Leases, Future Minimum Payments, 2017 4.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears      
Operating Leases, Future Minimum Payments, 2018 5.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
Operating Leases, Future Minimum Payments, 2019 5.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears      
Operating Leases, Future Minimum Payments, Thereafter 11.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter      
Total $ 32.6us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Leased Buildings -6340 Sequence Drive and 6310 Sequence Drive [Member]        
Leased Square Footage     129,000dxcm_LeasedSquareFootage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= dxcm_LeasedBuildings6340SequenceDriveand6310SequenceDriveMember
 
Leased Building, 6290 Sequence Drive [Member]        
Leased Square Footage     45,000dxcm_LeasedSquareFootage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= dxcm_LeasedBuilding6290SequenceDriveMember
 
Additional Available Space, 6290 Sequence Drive [Member]        
Leased Square Footage     45,000dxcm_LeasedSquareFootage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= dxcm_AdditionalAvailableSpace6290SequenceDriveMember
15,000dxcm_LeasedSquareFootage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= dxcm_AdditionalAvailableSpace6290SequenceDriveMember
6310,6340 and 6290 Sequence Drive Lease [Member]        
Leased Square Footage     174,000dxcm_LeasedSquareFootage
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dxcm_A63106340and6290SequenceDriveLeaseMember
 
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term 2dxcm_LesseeLeasingArrangementsOperatingLeasesNumberofRenewalTerm
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dxcm_A63106340and6290SequenceDriveLeaseMember
     
Lessee Leasing Arrangements, Operating Leases, Renewal Term 5 years      
Sweden Lease [Member]        
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term 2dxcm_LesseeLeasingArrangementsOperatingLeasesNumberofRenewalTerm
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dxcm_SwedenLeaseMember
     
Lessee Leasing Arrangements, Operating Leases, Renewal Term 3 years      
Subsidiaries [Member]        
Term of lease (years) 5 years