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Employee Benefit Plans and Stockholders' Equity - Stock Options Reserved for Future Issuance (Details) - shares shares in Millions	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Unvested restricted stock units (shares)	1.2	1.8
Reserved for future grant (shares)	4.5	4.9
Employee Stock Purchase Plan (shares)	0.8	0.9
Total (shares)	6.5	7.6

X

- Definition

Employee Stock Purchase Plan ESPP Shares In ESPP

+ References

No definition available.

+ Details

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Namespace Prefix:	dxcm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of stock options and awards reserved for future grant

+ References

No definition available.

+ Details

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Namespace Prefix:	dxcm_
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X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- References

No definition available.

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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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