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Cover Page
Apr. 28, 2020
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001093557
Document Type 8-K
Document Period End Date Apr. 28, 2020
Entity Registrant Name DEXCOM, INC.
Entity Incorporation, State or 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
Title of 12(b) Security Common Stock, $0.001 Par Value Per Share
Trading Symbol DXCM
Security Exchange Name NASDAQ
Entity Emerging Growth Company false