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Document and Entity Information
Oct. 20, 2020
Cover [Abstract]  
Entity Registrant Name DEXCOM INC
Amendment Flag false
Entity Central Index Key 0001093557
Document Type 8-K
Document Period End Date Oct. 20, 2020
Entity Incorporation State Country Code DE
Entity File Number 000-51222
Entity Tax Identification Number 33-0857544
Entity Address, Address Line One 6340 Sequence Drive
Entity Address, City or Town San Diego
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92121
City Area Code (858)
Local Phone Number 200-0200
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.001 Par Value Per Share
Trading Symbol DXCM
Security Exchange Name NASDAQ
Entity Emerging Growth Company false