$DXCM
DEXCOM INC Stock $dxcm

$dxcm Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000109355721000024 Filed on February 11, 2021

Income Statement

Concept	2020	2019 Q4	2019
Revenue	$1.927B	$462.8M	$1.476B
YoY Change	30.54%	36.92%	43.08%
Cost Of Revenue	$646.6M	$149.5M	$544.5M
YoY Change	18.75%	29.77%	48.08%
Gross Profit	$1.280B	$309.3M	$931.5M
YoY Change	37.42%	38.82%	40.31%
Gross Profit Margin	66.44%	66.83%	63.11%
Selling, General & Admin	$620.7M	$129.0M	$515.7M
YoY Change	20.36%	15.08%	19.15%
% of Gross Profit	48.49%	41.71%	55.36%
Research & Development	$359.9M	$78.80M	$273.5M
YoY Change	31.59%	-71.38%	36.96%
% of Gross Profit	28.11%	25.48%	29.36%
Depreciation & Amortization	$67.10M	$14.30M	$48.70M
YoY Change	37.78%	66.28%	67.35%
% of Gross Profit	5.24%	4.62%	5.23%
Operating Expenses	$980.6M	$207.8M	$789.2M
YoY Change	24.25%	-46.36%	-7.17%
Operating Profit	$299.5M	$101.5M	$142.3M
YoY Change	110.47%	-161.66%	-176.38%
Interest Expense	$84.70M	-$7.200M	$60.30M
YoY Change	40.46%	-57.4%	165.64%
% of Operating Profit	28.28%	-7.09%	42.38%
Other Income/Expense, Net	$16.10M		$26.40M
YoY Change	-39.02%		1000.0%
Pretax Income	$225.0M	$94.30M	$104.2M
YoY Change	115.93%	-153.31%	-182.37%
Income Tax	-$268.6M	$1.600M	$3.100M
% Of Pretax Income	-119.38%	1.7%	2.98%
Net Earnings	$493.6M	$92.70M	$101.1M
YoY Change	388.23%	-151.59%	-179.54%
Net Earnings / Revenue	25.62%	20.03%	6.85%
Basic Earnings Per Share	$5.23	$1.01	$1.11
Diluted Earnings Per Share	$5.06	$1.00	$1.10
COMMON SHARES
Basic Shares Outstanding	94.40M shares	91.53M shares	91.10M shares
Diluted Shares Outstanding	97.50M shares		92.30M shares

Balance Sheet

Concept	2020	2019 Q4	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$2.708B	$1.533B	$1.533B
YoY Change	76.59%	24.69%	10.66%
Cash & Equivalents	$817.6M	$446.2M	$446.2M
Short-Term Investments	$1.890B	$1.087B	$1.087B
Other Short-Term Assets	$53.90M	$30.00M	$30.00M
YoY Change	79.67%	81.82%	81.82%
Inventory	$234.7M	$119.8M	$119.8M
Prepaid Expenses
Receivables	$428.5M	$286.3M	$286.3M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.425B	$1.969B	$1.969B
YoY Change	73.9%	15.88%	15.88%
LONG-TERM ASSETS
Property, Plant & Equipment	$608.6M	$321.3M	$392.8M
YoY Change	54.94%	75.48%	114.53%
Goodwill		$18.60M
YoY Change		-0.53%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$237.8M	$14.20M	$14.20M
YoY Change	1574.65%	-3.4%	-3.4%
Total Long-Term Assets	$865.7M	$425.6M	$425.6M
YoY Change	103.41%	96.58%	96.58%
TOTAL ASSETS
Total Short-Term Assets	$3.425B	$1.969B	$1.969B
Total Long-Term Assets	$865.7M	$425.6M	$425.6M
Total Assets	$4.291B	$2.395B	$2.395B
YoY Change	79.14%	25.0%	25.0%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$163.3M	$102.3M	$102.3M
YoY Change	59.63%	35.5%	35.5%
Accrued Expenses	$448.6M	$255.6M	$255.6M
YoY Change	75.51%	77.5%	77.5%
Deferred Revenue		$1.700M
YoY Change		-41.38%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$8.800M	$600.0K	$600.0K
YoY Change	1366.67%
Total Short-Term Liabilities	$614.1M	$360.2M	$360.2M
YoY Change	70.49%	61.96%	61.96%
LONG-TERM LIABILITIES
Long-Term Debt	$1.721B	$1.074B	$1.074B
YoY Change	60.25%	5.55%	5.55%
Other Long-Term Liabilities	$128.7M	$20.10M	$78.10M
YoY Change	64.79%	0.5%	514.96%
Total Long-Term Liabilities	$1.850B	$20.10M	$1.152B
YoY Change	60.55%	0.5%	11.83%
TOTAL LIABILITIES
Total Short-Term Liabilities	$614.1M	$360.2M	$360.2M
Total Long-Term Liabilities	$1.850B	$20.10M	$1.152B
Total Liabilities	$2.464B	$1.512B	$1.512B
YoY Change	62.92%	20.73%	20.73%
SHAREHOLDERS EQUITY
Retained Earnings		-$695.7M
YoY Change		-12.92%
Common Stock		$1.676B
YoY Change		7.39%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$100.0M
YoY Change		0.0%
Treasury Stock Shares		800.0K shares
Shareholders Equity	$1.827B	$882.6M	$882.6M
YoY Change
Total Liabilities & Shareholders Equity	$4.291B	$2.395B	$2.395B
YoY Change	79.14%	25.0%	25.0%

Cashflow Statement

Concept	2020	2019 Q4	2019
OPERATING ACTIVITIES
Net Income	$493.6M	$92.70M	$101.1M
YoY Change	388.23%	-151.59%	-179.54%
Depreciation, Depletion And Amortization	$67.10M	$14.30M	$48.70M
YoY Change	37.78%	66.28%	67.35%
Cash From Operating Activities	$475.6M	$143.7M	$314.5M
YoY Change	51.22%	326.41%	155.28%
INVESTING ACTIVITIES
Capital Expenditures	$199.0M	-$44.10M	$180.0M
YoY Change	10.56%	149.15%	168.26%
Acquisitions	$0.00		$0.00
YoY Change			-100.0%
Other Investing Activities	$11.30M	-$50.20M	$1.200M
YoY Change	841.67%	-203.29%	20.0%
Cash From Investing Activities	-$1.018B	-$94.30M	-$1.015B
YoY Change	0.28%	-405.18%	626.18%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	-$15.30M		-$11.90M
YoY Change	28.57%		-113.34%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$912.1M	-100.0K	$10.70M
YoY Change	8424.3%	-100.01%	-98.49%
NET CHANGE
Cash From Operating Activities	$475.6M	143.7M	$314.5M
Cash From Investing Activities	-$1.018B	-94.30M	-$1.015B
Cash From Financing Activities	$912.1M	-100.0K	$10.70M
Net Change In Cash	$371.8M	49.30M	-$690.7M
YoY Change	-153.83%	-93.57%	-199.3%
FREE CASH FLOW
Cash From Operating Activities	$475.6M	$143.7M	$314.5M
Capital Expenditures	$199.0M	-$44.10M	$180.0M
Free Cash Flow	$276.6M	$187.8M	$134.5M
YoY Change	105.65%	265.37%	139.75%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001093557
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201602Member
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	000-51222
CY2020	dei	Entity Registrant Name EntityRegistrantName	DEXCOM, INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	33-0857544
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	6340 Sequence Drive
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	San Diego
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	92121
CY2020	dei	City Area Code CityAreaCode	858
CY2020	dei	Local Phone Number LocalPhoneNumber	200-0200
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.001 Par Value Per Share
CY2020	dei	Trading Symbol TradingSymbol	DXCM
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	38500000000	USD
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	96177363	shares
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	817600000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	446200000	USD
CY2020Q4	dxcm	Debt Securities Available For Sale And Equity Securities DebtSecuritiesAvailableForSaleAndEquitySecurities	1890100000	USD
CY2019Q4	dxcm	Debt Securities Available For Sale And Equity Securities DebtSecuritiesAvailableForSaleAndEquitySecurities	1087100000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	428500000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	286300000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	234700000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	119800000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	53900000	USD
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CY2020Q4	us-gaap	Assets Current AssetsCurrent	3424800000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	1969400000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	515300000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	321300000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	93300000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	71500000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	19300000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	18600000	USD
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	216400000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	0	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	21400000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	14200000	USD
CY2020Q4	us-gaap	Assets Assets	4290500000	USD
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CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	114300000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	88500000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	16500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	13600000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	2200000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	1700000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	614100000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	360200000	USD
CY2020Q4	us-gaap	Convertible Long Term Notes Payable ConvertibleLongTermNotesPayable	1667200000	USD
CY2019Q4	us-gaap	Convertible Long Term Notes Payable ConvertibleLongTermNotesPayable	1059700000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	101800000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	72400000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	80900000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	20100000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	2464000000.0	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1512400000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.001
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.001
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CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
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CY2020Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0	USD
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CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
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CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000.0	shares
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CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	96900000	shares
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CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	92400000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	91600000	shares
CY2020Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	100000	USD
CY2019Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	100000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2125300000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1675900000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3200000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2300000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-202100000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-695700000	USD
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	800000	shares
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	800000	shares
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	100000000.0	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	100000000.0	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1826500000	USD
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CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2395000000.0	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1926700000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1476000000.0	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1031600000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	646600000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	544500000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	367700000	USD
CY2020	us-gaap	Gross Profit GrossProfit	1280100000	USD
CY2019	us-gaap	Gross Profit GrossProfit	931500000	USD
CY2018	us-gaap	Gross Profit GrossProfit	663900000	USD
CY2020	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	359900000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	273500000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	199700000	USD
CY2020	dxcm	Collaborative Research And Development Fee CollaborativeResearchAndDevelopmentFee	0	USD
CY2019	dxcm	Collaborative Research And Development Fee CollaborativeResearchAndDevelopmentFee	0	USD
CY2018	dxcm	Collaborative Research And Development Fee CollaborativeResearchAndDevelopmentFee	217700000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	620700000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	515700000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	432800000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	980600000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	789200000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	850200000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	299500000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	142300000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-186300000	USD
CY2020	us-gaap	Interest Expense InterestExpense	84700000	USD
CY2019	us-gaap	Interest Expense InterestExpense	60300000	USD
CY2018	us-gaap	Interest Expense InterestExpense	22700000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5900000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
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CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	80100000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	16100000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	26400000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2400000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	225000000.0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	104200000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-126500000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-268600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3100000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	600000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	493600000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	101100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-127100000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.23
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.11
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.44
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	94400000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	91100000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	88200000	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.06
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.10
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CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	97500000	shares
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CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	88200000	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	493600000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	101100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-127100000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	1100000	USD
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CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	4000000.0	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-200000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	400000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	100000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	900000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4100000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	494500000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	101900000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-123000000.0	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	419400000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	1900000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	8900000	USD
CY2018	us-gaap	Stock Issued During Period Value Purchase Of Assets StockIssuedDuringPeriodValuePurchaseOfAssets	217700000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Convertible Debt With Conversion Feature AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature	-218900000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	171600000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	100000000.0	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	183800000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	101900000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-127100000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4100000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	663300000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	300000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	11600000	USD
CY2019	dxcm	Adjustments To Additional Paid In Capital Tax Benefit From Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalTaxBenefitFromEquityComponentOfConvertibleDebt	-700000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	102700000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	101100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	800000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	882600000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	300000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	15000000.0	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	289400000	USD
CY2020	dxcm	Adjustments To Additional Paid In Capital Tax Benefit From Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalTaxBenefitFromEquityComponentOfConvertibleDebt	62500000	USD
CY2020	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities Net Of Adjustments StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments	87800000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	119400000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	493600000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	900000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1826500000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	493600000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	101100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-127100000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67100000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	48700000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	29100000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	119400000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	102700000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	101900000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5900000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Paid In Kind Interest PaidInKindInterest	74000000.0	USD
CY2019	us-gaap	Paid In Kind Interest PaidInKindInterest	49600000	USD
CY2018	us-gaap	Paid In Kind Interest PaidInKindInterest	17900000	USD
CY2020	dxcm	R Dexpensethroughissuanceofcommonstock RDexpensethroughissuanceofcommonstock	0	USD
CY2019	dxcm	R Dexpensethroughissuanceofcommonstock RDexpensethroughissuanceofcommonstock	0	USD
CY2018	dxcm	R Dexpensethroughissuanceofcommonstock RDexpensethroughissuanceofcommonstock	217700000	USD
CY2020	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	0	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	0	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	36000000.0	USD
CY2020	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2019	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-4200000	USD
CY2018	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	44100000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-277300000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	200000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2200000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-13700000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1900000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6900000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	142300000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	60000000.0	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	93200000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	114500000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	49100000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	25500000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2400000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	7200000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3000000.0	USD
CY2020	dxcm	Increase Decreasein Operating Lease Assetsand Liabilities Net IncreaseDecreaseinOperatingLeaseAssetsandLiabilitiesNet	800000	USD
CY2019	dxcm	Increase Decreasein Operating Lease Assetsand Liabilities Net IncreaseDecreaseinOperatingLeaseAssetsandLiabilitiesNet	2400000	USD
CY2018	dxcm	Increase Decreasein Operating Lease Assetsand Liabilities Net IncreaseDecreaseinOperatingLeaseAssetsandLiabilitiesNet	0	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	194500000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	109000000.0	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	56200000	USD
CY2020	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	26100000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	16000000.0	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	23800000	USD
CY2020	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	18600000	USD
CY2019	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	-200000	USD
CY2018	us-gaap	Increase Decrease In Other Deferred Liability IncreaseDecreaseInOtherDeferredLiability	800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	475600000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	314500000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	123200000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	3058200000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2030400000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	452500000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	2250500000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	1196400000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	392100000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	199000000.0	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	180000000.0	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	67100000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	11300000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	11300000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1200000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1000000.0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1018000000.0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1015200000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-139800000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15300000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	11900000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	10800000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	100000000.0	USD
CY2020	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	1188800000	USD
CY2019	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	0	USD
CY2018	us-gaap	Proceeds From Convertible Debt ProceedsFromConvertibleDebt	836600000	USD
CY2020	dxcm	Payments For Repurchase Of Convertible Notes PaymentsForRepurchaseOfConvertibleNotes	282600000	USD
CY2019	dxcm	Payments For Repurchase Of Convertible Notes PaymentsForRepurchaseOfConvertibleNotes	0	USD
CY2018	dxcm	Payments For Repurchase Of Convertible Notes PaymentsForRepurchaseOfConvertibleNotes	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	183800000	USD
CY2020	dxcm	Purchaseof Convertible Note Hedge PurchaseofConvertibleNoteHedge	0	USD
CY2019	dxcm	Purchaseof Convertible Note Hedge PurchaseofConvertibleNoteHedge	0	USD
CY2018	dxcm	Purchaseof Convertible Note Hedge PurchaseofConvertibleNoteHedge	218900000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-9400000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1200000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1900000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	912100000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	10700000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	710400000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2100000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-700000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1800000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	371800000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-690700000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	695600000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	446400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1137100000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	441500000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	818200000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	446400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1137100000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	3700000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	817600000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	446200000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1137000000.0	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	600000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	200000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	100000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	818200000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	446400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1137100000	USD
CY2020	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	1350900000	USD
CY2019	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2018	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	35300000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	14200000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	10800000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	10600000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	4800000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	10400000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	3600000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	3600000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	2300000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:11pt;margin-top:11pt"><table style="border-collapse:collapse;display:inline-table;vertical-align:top;width:99.415%"><tr><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/></tr><tr><td colspan="15" style="border-bottom:1pt dotted #58a618;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#58a618;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:100%">Use of Estimates</span></td></tr></table></div><div style="margin-bottom:6pt;margin-top:6pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles, or GAAP, requires us to make certain estimates and assumptions that affect the amounts reported in our consolidated financial statements and the disclosures made in the accompanying notes. Areas requiring significant estimates include pharmacy rebates, transaction price, net accounts receivable, excess or obsolete inventories and the valuation of inventory, and accruals for litigation contingencies. Despite our intention to establish accurate estimates and use reasonable assumptions, actual results may differ from our estimates.</span></div>
CY2020	dxcm	Maturity Threshold Of Investments Classified To Cash Equivalents MaturityThresholdOfInvestmentsClassifiedToCashEquivalents	P90D
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<table style="border-collapse:collapse;display:inline-table;vertical-align:top;width:99.415%"><tr><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:18.900%"/><td style="width:0.1%"/></tr><tr><td colspan="15" style="border-bottom:1pt dotted #58a618;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#58a618;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:100%">Concentration of Credit Risk and Significant Customers</span></td></tr></table>Financial instruments which potentially subject us to concentrations of credit risk consist primarily of cash, cash equivalents, short-term marketable securities, and accounts receivable. We limit our exposure to credit risk by placing our cash and investments with high credit quality financial institutions. We have also established guidelines regarding diversification of our investments and their maturities that are designed to maintain principal and maximize liquidity. We review these guidelines periodically and modify them to take advantage of trends in yields and interest rates and changes in our operations and financial position.
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2018	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020	dxcm	Revenue Recognition Sales Returns Coverage Period RevenueRecognitionSalesReturnsCoveragePeriod	P30D
CY2020Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	10400000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	8200000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	2100000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	76500000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	33100000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	24000000.0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	493600000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	101100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-127100000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.23
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.11
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.44
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.06
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.10
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.44
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	94400000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	91100000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	88200000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	97500000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	92300000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	88200000	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	7200000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	14600000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	17200000	shares
CY2020Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	641500000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1890100000	USD
CY2020Q4	us-gaap	Other Assets Fair Value Disclosure OtherAssetsFairValueDisclosure	3400000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	2535000000.0	USD
CY2019Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	255000000.0	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1087100000	USD
CY2019Q4	us-gaap	Other Assets Fair Value Disclosure OtherAssetsFairValueDisclosure	700000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1342800000	USD
CY2020Q4	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2019Q4	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2019	dxcm	Fair Value Assets Level3 Transfers Amount FairValueAssetsLevel3TransfersAmount	0	USD
CY2020	dxcm	Fair Value Assets Level3 Transfers Amount FairValueAssetsLevel3TransfersAmount	0	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2018	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1890000000.0	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	200000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	100000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1890100000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1086700000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	500000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	100000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1087100000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Term DebtSecuritiesAvailableForSaleTerm	P12M
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	0	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-4200000	USD
CY2020	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	0	USD
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	80100000	USD
CY2019	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-4200000	USD
CY2018	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	44100000	USD
CY2020	us-gaap	Debt And Equity Securities Unrealized Gain Loss DebtAndEquitySecuritiesUnrealizedGainLoss	0	USD
CY2019	us-gaap	Debt And Equity Securities Unrealized Gain Loss DebtAndEquitySecuritiesUnrealizedGainLoss	0	USD
CY2018	us-gaap	Debt And Equity Securities Unrealized Gain Loss DebtAndEquitySecuritiesUnrealizedGainLoss	36000000.0	USD
CY2020Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	435700000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	292100000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	7200000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	5800000	USD
CY2020Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	428500000	USD
CY2019Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	286300000	USD
CY2020Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	69900000	USD
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	64900000	USD
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	14200000	USD
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	11100000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	150600000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	43800000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	234700000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	119800000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	669500000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	426300000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	154200000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	105000000.0	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	515300000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	321300000	USD
CY2020	us-gaap	Depreciation Depreciation	64000000.0	USD
CY2019	us-gaap	Depreciation Depreciation	46900000	USD
CY2018	us-gaap	Depreciation Depreciation	28600000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-13600000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-10500000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-5400000	USD
CY2020Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	163300000	USD
CY2019Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	102300000	USD
CY2020Q4	dxcm	Accrued Tax Audit And Legal Fees AccruedTaxAuditAndLegalFees	15300000	USD
CY2019Q4	dxcm	Accrued Tax Audit And Legal Fees AccruedTaxAuditAndLegalFees	14000000.0	USD
CY2020Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	11700000	USD
CY2020Q4	dxcm	Pharmacy Rebates PharmacyRebates	247000000.0	USD
CY2019Q4	dxcm	Pharmacy Rebates PharmacyRebates	93300000	USD
CY2019Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	7400000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	43800000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	39400000	USD
CY2020Q4	us-gaap	Accounts Payable And Other Accrued Liabilities Current AccountsPayableAndOtherAccruedLiabilitiesCurrent	481100000	USD
CY2019Q4	us-gaap	Accounts Payable And Other Accrued Liabilities Current AccountsPayableAndOtherAccruedLiabilitiesCurrent	256400000	USD
CY2019Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	7400000	USD
CY2018Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	6800000	USD
CY2020	dxcm	Standard Product Warranty Accrual Charges To Costs And Expenses StandardProductWarrantyAccrualChargesToCostsAndExpenses	41300000	USD
CY2019	dxcm	Standard Product Warranty Accrual Charges To Costs And Expenses StandardProductWarrantyAccrualChargesToCostsAndExpenses	32700000	USD
CY2020	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	37000000.0	USD
CY2019	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	32100000	USD
CY2020Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	11700000	USD
CY2019Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	7400000	USD
CY2020Q4	dxcm	Financing Lease Obligation FinancingLeaseObligation	54000000.0	USD
CY2019Q4	dxcm	Financing Lease Obligation FinancingLeaseObligation	14400000	USD
CY2020Q4	us-gaap	Contractual Obligation ContractualObligation	12600000	USD
CY2019Q4	us-gaap	Contractual Obligation ContractualObligation	0	USD
CY2020Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	14300000	USD
CY2019Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	5700000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	80900000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	20100000	USD
CY2020	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	9300000	USD
CY2019	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	9300000	USD
CY2018	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	3500000	USD
CY2020	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-68600000	USD
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-45800000	USD
CY2018	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-16000000.0	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4000000.0	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3700000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1800000	USD
CY2020	us-gaap	Interest Expense Debt InterestExpenseDebt	81900000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	58800000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	21300000	USD
CY2020Q2	dxcm	Payments For Repurchase Of Convertible Notes PaymentsForRepurchaseOfConvertibleNotes	282600000	USD
CY2020Q2	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	1953067	shares
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	5900000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	193700000	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26700000	USD
CY2019Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	15300000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	40400000	USD
CY2019Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	15900000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	21200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	10700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	22100000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	4200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	22400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	4300000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	20800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	4500000	USD
CY2020	dxcm	Recorded Unconditional Purchase Obligation Due Within One Year Maximum Term RecordedUnconditionalPurchaseObligationDueWithinOneYearMaximumTerm	P1Y
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	20000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	4600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	32000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	68700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	138500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	97000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	20200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	34200000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	118300000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	62800000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	16500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	8800000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	101800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	54000000.0	USD
CY2020	dxcm	Lessee Future Lease Cost Lease Notyet Commenced LesseeFutureLeaseCostLeaseNotyetCommenced	16300000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	4500000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2000000.0	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1100000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1900000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	800000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	18400000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	12200000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1300000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	3500000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	4200000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	3900000	USD
CY2020	us-gaap	Lease Cost LeaseCost	27800000	USD
CY2019	us-gaap	Lease Cost LeaseCost	21500000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	12500000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	18300000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	14300000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	700000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	800000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	8500000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	500000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	33500000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	80600000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	41700000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	15500000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y1M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y2M12D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P23Y3M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P13Y3M18D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	5.0
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	5.0
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	5.2
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	5.0
CY2020	dxcm	Lessee Operating Leases Lease Cost Amortization LesseeOperatingLeasesLeaseCostAmortization	12400000	USD
CY2019	dxcm	Lessee Operating Leases Lease Cost Amortization LesseeOperatingLeasesLeaseCostAmortization	9100000	USD
CY2020Q4	us-gaap	Recorded Unconditional Purchase Obligation Due Within One Year RecordedUnconditionalPurchaseObligationDueWithinOneYear	335600000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	270700000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	119100000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-28300000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-45700000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-14900000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-98200000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	225000000.0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	104200000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-126500000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6100000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000000.0	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2700000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2600000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1900000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	100000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8700000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2900000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2800000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-198800000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-51400000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1700000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-500000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-27100000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	200000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-277300000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	200000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2200000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-268600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3100000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	600000	USD
CY2019Q4	dxcm	Deferred Tax Liabilities Convertible Debt Discount DeferredTaxLiabilitiesConvertibleDebtDiscount	0	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	92200000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	19600000	USD
CY2020	dxcm	Research And Development Tax Credits Utilized ResearchAndDevelopmentTaxCreditsUtilized	2400000	USD
CY2020	dxcm	Unused Expired Federal Income Tax Credits UnusedExpiredFederalIncomeTaxCredits	1900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	69200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	127400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	53600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	57100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	101100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	78600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	13000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	14000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	10900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	16900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	110300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	62000000.0	USD
CY2020Q4	dxcm	Deferred Tax Assets Convertible Debt DeferredTaxAssetsConvertibleDebt	0	USD
CY2019Q4	dxcm	Deferred Tax Assets Convertible Debt DeferredTaxAssetsConvertibleDebt	1700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	364100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	351700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	55500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	332200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	308600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	19500000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	36300000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	19600000	USD
CY2020Q4	dxcm	Deferred Tax Liabilities Convertible Debt Discount DeferredTaxLiabilitiesConvertibleDebtDiscount	55900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	216400000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-28700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	100000	USD
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-287200000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	47300000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	21900000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-26600000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3200000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-2300000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-5500000	USD
CY2020	dxcm	Effective Income Tax Reconciliation Permanent Items EffectiveIncomeTaxReconciliationPermanentItems	13100000	USD
CY2019	dxcm	Effective Income Tax Reconciliation Permanent Items EffectiveIncomeTaxReconciliationPermanentItems	1000000.0	USD
CY2018	dxcm	Effective Income Tax Reconciliation Permanent Items EffectiveIncomeTaxReconciliationPermanentItems	1300000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	24400000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	10800000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	11700000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-100000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	5600000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-14700000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-5100000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-4100000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2020	dxcm	Effective Income Tax Reconciliation Impactof Adoptionof Asu201616 EffectiveIncomeTaxReconciliationImpactofAdoptionofASU201616	0	USD
CY2019	dxcm	Effective Income Tax Reconciliation Impactof Adoptionof Asu201616 EffectiveIncomeTaxReconciliationImpactofAdoptionofASU201616	0	USD
CY2018	dxcm	Effective Income Tax Reconciliation Impactof Adoptionof Asu201616 EffectiveIncomeTaxReconciliationImpactofAdoptionofASU201616	-13300000	USD
CY2020	dxcm	Effective Income Tax Reconciliation Impactof Tcja EffectiveIncomeTaxReconciliationImpactofTCJA	0	USD
CY2019	dxcm	Effective Income Tax Reconciliation Impactof Tcja EffectiveIncomeTaxReconciliationImpactofTCJA	0	USD
CY2018	dxcm	Effective Income Tax Reconciliation Impactof Tcja EffectiveIncomeTaxReconciliationImpactofTCJA	-400000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	100000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1300000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-275000000.0	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	3400000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	56900000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-268600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3100000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	600000	USD
CY2020Q2	dxcm	Share Based Compensation Intercompany Cross Charge ShareBasedCompensationIntercompanyCrossCharge	32000000.0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22800000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3400000	USD
CY2018	dxcm	Unrecognized Tax Benefits Decrease Resultingfrom Tax Cuts And Jobs Act Of2017 UnrecognizedTaxBenefitsDecreaseResultingfromTaxCutsAndJobsActOf2017	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	25900000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	900000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4500000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	29500000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8000000.0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	36600000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	23500000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	USD
CY2020	dxcm	Possible Extension Periodof Tax Holiday PossibleExtensionPeriodofTaxHoliday	P3Y
CY2020Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	1400000	USD
CY2020Q4	dxcm	Employee Stock Purchase Plan Espp Number Of Shares Authorized EmployeeStockPurchasePlanESPPNumberOfSharesAuthorized	1500000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate	0.10
CY2020	dxcm	Employee Purchase Price Floor Percentage EmployeePurchasePriceFloorPercentage	0.85
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	9800000	shares
CY2018	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	800000	shares
CY2019	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
CY2020	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
CY2020	dxcm	Options In Money Number OptionsInMoneyNumber	0	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7900000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7400000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	30000000.0	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1200000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1800000	shares
CY2020Q4	dxcm	Stock Options Reserved For Future Grant StockOptionsReservedForFutureGrant	4500000	shares
CY2019Q4	dxcm	Stock Options Reserved For Future Grant StockOptionsReservedForFutureGrant	4900000	shares
CY2020Q4	dxcm	Employee Stock Purchase Plan Espp Shares In Espp EmployeeStockPurchasePlanEsppSharesInEspp	800000	shares
CY2019Q4	dxcm	Employee Stock Purchase Plan Espp Shares In Espp EmployeeStockPurchasePlanEsppSharesInEspp	900000	shares
CY2020Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	6500000	shares
CY2019Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	7600000	shares
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	102700000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	101900000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	119400000	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	147600000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1926700000	USD
CY2020	dxcm	Revenue Percentage RevenuePercentage	1
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1476000000.0	USD
CY2019	dxcm	Revenue Percentage RevenuePercentage	1
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1031600000	USD
CY2018	dxcm	Revenue Percentage RevenuePercentage	1
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1926700000	USD
CY2020	dxcm	Revenue Percentage RevenuePercentage	1
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1476000000.0	USD
CY2019	dxcm	Revenue Percentage RevenuePercentage	1
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1031600000	USD
CY2018	dxcm	Revenue Percentage RevenuePercentage	1
CY2017Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	11400000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	3600000	USD
CY2018	dxcm	Sec Schedule1209 Valuation Allowancesand Reserves Deduction Writeoffsand Adjustments SECSchedule1209ValuationAllowancesandReservesDeductionWriteoffsandAdjustments	8300000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Recoveries ValuationAllowancesAndReservesRecoveries	500000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	7200000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	7200000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	900000	USD
CY2019	dxcm	Sec Schedule1209 Valuation Allowancesand Reserves Deduction Writeoffsand Adjustments SECSchedule1209ValuationAllowancesandReservesDeductionWriteoffsandAdjustments	3000000.0	USD
CY2019	us-gaap	Valuation Allowances And Reserves Recoveries ValuationAllowancesAndReservesRecoveries	700000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5800000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5800000	USD
CY2020	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	3200000	USD
CY2020	dxcm	Sec Schedule1209 Valuation Allowancesand Reserves Deduction Writeoffsand Adjustments SECSchedule1209ValuationAllowancesandReservesDeductionWriteoffsandAdjustments	2100000	USD
CY2020	us-gaap	Valuation Allowances And Reserves Recoveries ValuationAllowancesAndReservesRecoveries	300000	USD
CY2020Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	7200000	USD

Files In Submission

Name	View Source	Status
0001093557-21-000024-index-headers.html	Edgar Link	pending
0001093557-21-000024-index.html	Edgar Link	pending
0001093557-21-000024.txt	Edgar Link	pending
0001093557-21-000024-xbrl.zip	Edgar Link	pending
dxcm-20201231.htm	Edgar Link	pending
dxcm-20201231.xsd	Edgar Link	pending
dxcm-20201231_cal.xml	Edgar Link	unprocessable
dxcm-20201231_def.xml	Edgar Link	unprocessable
dxcm-20201231_g1.jpg	Edgar Link	pending
dxcm-20201231_g2.jpg	Edgar Link	pending
dxcm-20201231_g3.jpg	Edgar Link	pending
dxcm-20201231_g4.jpg	Edgar Link	pending
dxcm-20201231_htm.xml	Edgar Link	completed
dxcm-20201231_lab.xml	Edgar Link	unprocessable
dxcm-20201231_pre.xml	Edgar Link	unprocessable
dxcm12312020ex1043doindemn.htm	Edgar Link	pending
dxcm12312020ex10442015espp.htm	Edgar Link	pending
dxcm12312020ex10452015espp.htm	Edgar Link	pending
dxcm12312020ex1047doubleda.htm	Edgar Link	pending
dxcm12312020ex404securitie.htm	Edgar Link	pending
dxcm12312020exhibit1046moy.htm	Edgar Link	pending
dxcm12312020exhibit2101.htm	Edgar Link	pending
dxcm12312020exhibit2301.htm	Edgar Link	pending
dxcm12312020exhibit3101.htm	Edgar Link	pending
dxcm12312020exhibit3102.htm	Edgar Link	pending
dxcm12312020exhibit3201.htm	Edgar Link	pending
dxcm12312020exhibit3202.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$DXCM
DEXCOM INC Stock $dxcm

2020 Form 10-K Financial Statement

#000109355721000024 Filed on February 11, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$DXCM DEXCOM INC Stock $dxcm

2020 Form 10-K Financial Statement

#000109355721000024 Filed on February 11, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$DXCM
DEXCOM INC Stock $dxcm