$FSLY
Fastly, Inc. Stock $fsly

$fsly Overview Financials Valuation SEC Filings Company Website

2024 Q4 Form 10-Q Financial Statement

#000151741324000216 Filed on November 07, 2024

Income Statement

Concept	2024 Q4	2024 Q3
Revenue		$137.2M
YoY Change		7.35%
Cost Of Revenue		$62.47M
YoY Change		1.19%
Gross Profit		$74.74M
YoY Change		13.1%
Gross Profit Margin		54.47%
Selling, General & Admin		$73.17M
YoY Change		-9.72%
% of Gross Profit		97.9%
Research & Development		$31.88M
YoY Change		-18.39%
% of Gross Profit		42.66%
Depreciation & Amortization		$13.70M
YoY Change		4.58%
% of Gross Profit		18.33%
Operating Expenses		$115.3M
YoY Change		-7.31%
Operating Profit		-$40.59M
YoY Change		-30.43%
Interest Expense		$3.346M
YoY Change		288.17%
% of Operating Profit
Other Income/Expense, Net		-$317.0K
YoY Change		1881.25%
Pretax Income		-$37.56M
YoY Change		-30.84%
Income Tax		$500.0K
% Of Pretax Income
Net Earnings		-$38.02M
YoY Change		-30.0%
Net Earnings / Revenue		-27.71%
Basic Earnings Per Share		-$0.27
Diluted Earnings Per Share		-$0.27
COMMON SHARES
Basic Shares Outstanding	140.3M shares	138.6M shares
Diluted Shares Outstanding		139.2M shares

Balance Sheet

Concept	2024 Q4	2024 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments		$308.2M
YoY Change		-28.04%
Cash & Equivalents		$217.5M
Short-Term Investments		$90.73M
Other Short-Term Assets		$28.01M
YoY Change		14.33%
Inventory
Prepaid Expenses
Receivables		$116.8M
Other Receivables		$0.00
Total Short-Term Assets		$453.1M
YoY Change		-17.84%
LONG-TERM ASSETS
Property, Plant & Equipment		$241.4M
YoY Change		-5.83%
Goodwill		$670.4M
YoY Change		0.01%
Intangibles		$47.78M
YoY Change		-29.09%
Long-Term Investments		$0.00
YoY Change		-100.0%
Other Assets		$72.58M
YoY Change		-23.08%
Total Long-Term Assets		$1.019B
YoY Change		-6.47%
TOTAL ASSETS
Total Short-Term Assets		$453.1M
Total Long-Term Assets		$1.019B
Total Assets		$1.472B
YoY Change		-10.3%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable		$11.35M
YoY Change		98.39%
Accrued Expenses		$40.85M
YoY Change		-27.81%
Deferred Revenue		$29.72M
YoY Change		-10.64%
Short-Term Debt		$0.00
YoY Change
Long-Term Debt Due		$4.882M
YoY Change		-74.7%
Total Short-Term Liabilities		$114.2M
YoY Change		-20.32%
LONG-TERM LIABILITIES
Long-Term Debt		$344.5M
YoY Change		-27.14%
Other Long-Term Liabilities		$3.029M
YoY Change		-29.53%
Total Long-Term Liabilities		$347.5M
YoY Change		-27.16%
TOTAL LIABILITIES
Total Short-Term Liabilities		$114.2M
Total Long-Term Liabilities		$347.5M
Total Liabilities		$502.3M
YoY Change		-25.26%
SHAREHOLDERS EQUITY
Retained Earnings		-$959.9M
YoY Change		18.31%
Common Stock		$3.000K
YoY Change		50.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity		$969.5M
YoY Change
Total Liabilities & Shareholders Equity		$1.472B
YoY Change		-10.3%

Cashflow Statement

Concept	2024 Q4	2024 Q3
OPERATING ACTIVITIES
Net Income		-$38.02M
YoY Change		-30.0%
Depreciation, Depletion And Amortization		$13.70M
YoY Change		4.58%
Cash From Operating Activities		$5.002M
YoY Change		-159.62%
INVESTING ACTIVITIES
Capital Expenditures		$8.814M
YoY Change		67.25%
Acquisitions
YoY Change
Other Investing Activities		$75.13M
YoY Change		480.15%
Cash From Investing Activities		$66.32M
YoY Change		763.49%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities		-1.109M
YoY Change		-58.62%
NET CHANGE
Cash From Operating Activities		5.002M
Cash From Investing Activities		66.32M
Cash From Financing Activities		-1.109M
Net Change In Cash		70.21M
YoY Change		-2171.06%
FREE CASH FLOW
Cash From Operating Activities		$5.002M
Capital Expenditures		$8.814M
Free Cash Flow		-$3.812M
YoY Change		-72.09%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001517413
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
	dei	Entity Address Address Line1 EntityAddressAddressLine1	475 Brannan Street, Suite 300
	dei	Entity Address City Or Town EntityAddressCityOrTown	San Francisco
	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	94107
	dei	City Area Code CityAreaCode	844
	dei	Local Phone Number LocalPhoneNumber	432-7859
	dei	Security12b Title Security12bTitle	Class A Common Stock, $0.00002 par value
	dei	Trading Symbol TradingSymbol	FSLY
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	107921000	usd
CY2024Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	6847000	usd
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CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	120498000	usd
CY2024Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	28011000	usd
CY2024Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	72576000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	90779000	usd
CY2024Q3	us-gaap	Assets Assets	1471754000	usd
CY2023Q4	us-gaap	Assets Assets	1525191000	usd
CY2024Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	11354000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	5611000	usd
CY2024Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	40854000	usd
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	61818000	usd
CY2024Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4882000	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	15684000	usd
CY2024Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	23857000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	24042000	usd
CY2024Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	33261000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	40539000	usd
CY2024Q3	us-gaap	Liabilities Current LiabilitiesCurrent	114208000	usd
CY2024Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	3029000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4416000	usd
CY2024Q3	us-gaap	Liabilities Liabilities	502300000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	545703000	usd
CY2024Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2024Q3	us-gaap	Common Stock Value CommonStockValue	3000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	3000	usd
CY2024Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1929397000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1815245000	usd
CY2024Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-22000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1008000	usd
CY2024Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-959924000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-834752000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	969454000	usd
CY2024Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1471754000	usd
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	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	143111000	usd
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	87245000	usd
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	84651000	usd
	fsly	Deferred Payment For Business Combinations DeferredPaymentForBusinessCombinations	3771000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	310000	usd
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	6083000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-9782000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	48000	usd
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CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	108071000	usd
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	us-gaap	Interest Paid Net InterestPaidNet	453000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	739000	usd
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	342000	usd
	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	7952000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5827000	usd
	fsly	Noncash Change In Operating Lease Assets And Liabilities NoncashChangeInOperatingLeaseAssetsAndLiabilities	-978000	usd
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	30149000	usd
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	27616000	usd
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	13900000	usd
CY2024Q3	fsly	Cash Cash Equivalents And Debt Securities Available For Sale CashCashEquivalentsAndDebtSecuritiesAvailableForSale	308247000	usd
CY2023Q4	fsly	Cash Cash Equivalents And Debt Securities Available For Sale CashCashEquivalentsAndDebtSecuritiesAvailableForSale	328808000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	47776000	usd
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.42
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	7054000	usd
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	20455000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	463673000	usd
CY2024Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	180288000	usd
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CY2024Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	47700000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	62475000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	979488000	usd
CY2024Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	137206000	usd
CY2023Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	127816000	usd
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	403097000	usd
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	368211000	usd
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	us-gaap	Gross Profit GrossProfit	220875000	usd
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	fsly	Asset Impairment Charges Excluding Operating Lease Impairment AssetImpairmentChargesExcludingOperatingLeaseImpairment	3696000	usd
	fsly	Asset Impairment Charges Excluding Operating Lease Impairment AssetImpairmentChargesExcludingOperatingLeaseImpairment	4316000	usd
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	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-213000	usd
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1069000	usd
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	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-4142000	usd
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	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	6452000	usd
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	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2024-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
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	dei	Entity Registrant Name EntityRegistrantName	FASTLY, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-5411834
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CY2024Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	3819000	usd
CY2023Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	4908000	usd
	us-gaap	Investment Income Interest InvestmentIncomeInterest	11604000	usd
	us-gaap	Investment Income Interest InvestmentIncomeInterest	13602000	usd
CY2024Q3	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	473000	usd
CY2023Q3	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	862000	usd
	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	1516000	usd
	us-gaap	Interest Expense Nonoperating InterestExpenseNonoperating	3307000	usd
CY2024Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-317000	usd
CY2023Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-16000	usd
CY2024Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-37561000	usd
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	455000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1463000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	244000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	-38016000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	-54311000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-125172000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-109702000	usd
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.91
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.91
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.86
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.86
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	137097000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	137097000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	127735000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	127735000	shares
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	-38016000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	-54311000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-125172000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-109702000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-8000	usd
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	0	usd
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	550000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	260000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1226000	usd
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	986000	usd
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	6802000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	260000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1218000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	986000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7352000	usd
CY2024Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-37756000	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-53093000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-124186000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-102350000	usd
CY2024Q2	us-gaap	Stockholders Equity StockholdersEquity	981187000	usd
CY2024Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	19000	usd
CY2024Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	26004000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	-38016000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	260000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	969454000	usd
CY2023Q2	us-gaap	Stockholders Equity StockholdersEquity	987754000	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1137000	usd
CY2023Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	32774000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	-54311000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1218000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	968572000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	979488000	usd
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	310000	usd
	fsly	Stock Issued During Period Value Restricted Stock Award Bonus Program StockIssuedDuringPeriodValueRestrictedStockAwardBonusProgram	26849000	usd
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	4053000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	82940000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-125172000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	986000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	969454000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	955158000	usd
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2008000	usd
	fsly	Stock Issued During Period Value Restricted Stock Award Bonus Program StockIssuedDuringPeriodValueRestrictedStockAwardBonusProgram	16599000	usd
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	4977000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	92180000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-109702000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7352000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	968572000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-125172000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-109702000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	40251000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	38015000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14699000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	15525000	usd
	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	16819000	usd
	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	17227000	usd
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1061000	usd
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2020000	usd
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	13877000	usd
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	11253000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	82985000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	100856000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	900000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	usd
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2400000	usd
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1311000	usd
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-444000	usd
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-505000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	3466000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-344000	usd
	fsly	Operating Lease Impairment Loss Recurring OperatingLeaseImpairmentLossRecurring	371000	usd
	fsly	Operating Lease Impairment Loss Recurring OperatingLeaseImpairmentLossRecurring	588000	usd
	fsly	Asset Impairment Charges Excluding Operating Lease Impairment AssetImpairmentChargesExcludingOperatingLeaseImpairment	3696000	usd
	fsly	Asset Impairment Charges Excluding Operating Lease Impairment AssetImpairmentChargesExcludingOperatingLeaseImpairment	4316000	usd
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	usd
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	36760000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-83000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	257000	usd
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-1298000	usd
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10355000	usd
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	7420000	usd
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-4602000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7729000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	16269000	usd
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	4514000	usd
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1258000	usd
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-6253000	usd
	fsly	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	-16937000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4942000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	11186000	usd
	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	155099000	usd
	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	73091000	usd
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	0	usd
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	775000	usd
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	289709000	usd
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	428125000	usd
	fsly	Advances For Payments Of Property Plant And Equipment AdvancesForPaymentsOfPropertyPlantAndEquipment	790000	usd
	fsly	Advances For Payments Of Property Plant And Equipment AdvancesForPaymentsOfPropertyPlantAndEquipment	0	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5361000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8283000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	24000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	49000	usd
	us-gaap	Payments For Software PaymentsForSoftware	20492000	usd
	us-gaap	Payments For Software PaymentsForSoftware	15390000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	107991000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	332185000	usd
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	usd
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	196934000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	12404000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	21243000	usd
	fsly	Deferred Payment For Business Combinations DeferredPaymentForBusinessCombinations	4393000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2008000	usd
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	7009000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-213553000	usd
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	538000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	126909000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	270450000	usd
	us-gaap	Interest Paid Net InterestPaidNet	1286000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	369000	usd
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1103000	usd
	fsly	Capital Expenditures Incurred But Not Yet Paid Net CapitalExpendituresIncurredButNotYetPaidNet	1278000	usd
	fsly	Capital Expenditures Incurred But Not Yet Paid Net CapitalExpendituresIncurredButNotYetPaidNet	519000	usd
	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	6912000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1324000	usd
	fsly	Noncash Change In Operating Lease Assets And Liabilities NoncashChangeInOperatingLeaseAssetsAndLiabilities	4762000	usd
	fsly	Deployments Of Prepaid Capital Equipment DeploymentsOfPrepaidCapitalEquipment	11912000	usd
	fsly	Deployments Of Prepaid Capital Equipment DeploymentsOfPrepaidCapitalEquipment	1664000	usd
CY2024Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	217514000	usd
CY2023Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	270300000	usd
CY2024Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	0	usd
CY2023Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	150000	usd
CY2024Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	217514000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	270450000	usd
	us-gaap	Nature Of Operations NatureOfOperations	Nature of Business<div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Fastly, Inc. has built an edge cloud platform that can process, serve, and secure its customers' applications as close to their end users as possible. The Company was incorporated in Delaware in 2011 and is headquartered in San Francisco, California.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">As used herein, “Fastly,” “the Company,” “its” and similar terms include Fastly, Inc. and its subsidiaries, unless the context indicates otherwise.</span></div>
	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenue, costs and expenses, and related disclosures. Actual results and outcomes could differ significantly from the Company’s estimates, judgments, and assumptions. Significant estimates, judgments, and assumptions used in these financial statements include, but are not limited to, those related to revenue, accounts receivable and related reserves, internal-use software development costs, the incremental borrowing rate related to the Company’s lease liabilities,</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">fair value of assets acquired and liabilities assumed during business combinations, useful lives of acquired intangible assets and property and equipment, fair value of the Company’s long-lived assets as well as goodwill, income tax reserves, and accounting for stock-based compensation. Estimates are periodically reviewed in light of changes in circumstances, facts, and experience. The effects of material revisions in estimates are reflected in the consolidated financial statements in the period of change and prospectively from the date of the change in estimate.</span></div>
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Concentrations of Credit Risk</span></div><div><span><br/></span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities and accounts receivable. </span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company’s cash, cash equivalents, and marketable securities primarily consisted of bank deposits, money market funds, investment-grade commercial paper, corporate notes and bonds, U.S. treasury securities, municipal securities, foreign government and supranational securities and asset-backed securities held at major financial institutions that the Company believes to be of high credit standing. The primary focus of its investment strategy is to preserve capital and meet liquidity requirements. The Company’s investment policy limits the amount of credit exposure with any one financial institution or commercial issuer. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash and cash equivalents to the extent recorded in the balance sheets. While the Company has not experienced any losses in such accounts and the Company has historically maintained its cash in multiple financial institutions, the failure of Silicon Valley Bank (“SVB”) in March 2023, at which the Company held cash and cash equivalents in multiple accounts, exposed the Company to limited credit risk prior to the completion by the Federal Deposit Insurance Corporation (“FDIC”) of the resolution of SVB in a manner that fully protected all depositors.</span></div>Concentrations of credit risk with respect to accounts receivable are primarily limited to certain customers to which the Company makes substantial sales. The Company’s customer base consists of a large number of geographically dispersed customers diversified across several industries.
CY2024Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	137206000	usd
CY2023Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	127816000	usd
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	403097000	usd
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	368211000	usd
CY2024Q3	fsly	Enterprise Customer Threshold EnterpriseCustomerThreshold	100000	usd
CY2024Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	137206000	usd
CY2023Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	127816000	usd
	fsly	Number Of Product Lines NumberOfProductLines	3	product_line
CY2024Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	137206000	usd
	us-gaap	Revenue Performance Obligation Description Of Payment Terms RevenuePerformanceObligationDescriptionOfPaymentTerms	The Company’s payment terms and conditions vary by contract type, and generally range from 30 to 90 days.
CY2024Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	1121000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	621000	usd
CY2024Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	32496000	usd
CY2024Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	14748000	usd
CY2023Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	12279000	usd
CY2024Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	235400000	usd
CY2024Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.77
CY2024Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2024Q3	us-gaap	Capitalized Contract Cost Net Noncurrent CapitalizedContractCostNetNoncurrent	53842000	usd
CY2024Q3	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	4800000	usd
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	11300000	usd
CY2024Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	217514000	usd
CY2024Q3	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	90733000	usd
CY2024Q3	us-gaap	Marketable Securities Noncurrent MarketableSecuritiesNoncurrent	0	usd
CY2024Q3	us-gaap	Marketable Securities MarketableSecurities	90733000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	289945000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	66000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	9000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	290002000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	287307000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	23000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	957000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	286373000	usd
CY2024Q3	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	199269000	usd
CY2024Q3	us-gaap	Marketable Securities MarketableSecurities	90733000	usd
CY2024Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	290002000	usd
CY2023Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	86652000	usd
CY2023Q4	us-gaap	Marketable Securities MarketableSecurities	220887000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	150000	usd
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	307689000	usd
CY2024Q3	us-gaap	Restricted Cash RestrictedCash	0	usd
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	200000	usd
CY2024Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	360995000	usd
CY2023Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	333911000	usd
CY2024Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	180707000	usd
CY2023Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	157303000	usd
CY2024Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	180288000	usd
CY2023Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	176608000	usd
CY2024Q3	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	600000	usd
	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	2400000	usd
CY2023Q3	fsly	Asset Impairment Charges Excluding Operating Lease Impairment AssetImpairmentChargesExcludingOperatingLeaseImpairment	4300000	usd
	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	0	usd
CY2024Q3	us-gaap	Depreciation Depreciation	13700000	usd
CY2023Q3	us-gaap	Depreciation Depreciation	13100000	usd
	us-gaap	Depreciation Depreciation	40300000	usd
	us-gaap	Depreciation Depreciation	38000000.0	usd
CY2024Q3	us-gaap	Capitalized Contract Cost Net Noncurrent CapitalizedContractCostNetNoncurrent	53842000	usd
CY2023Q4	us-gaap	Capitalized Contract Cost Net Noncurrent CapitalizedContractCostNetNoncurrent	61981000	usd
CY2024Q3	fsly	Advances On Property And Equipment AdvancesOnPropertyAndEquipment	13456000	usd
CY2023Q4	fsly	Advances On Property And Equipment AdvancesOnPropertyAndEquipment	24509000	usd
CY2024Q3	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	5278000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	4289000	usd
CY2024Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	72576000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	90779000	usd
CY2024Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	14572000	usd
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	14918000	usd
CY2024Q3	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	4364000	usd
CY2023Q4	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	24614000	usd
CY2024Q3	fsly	Accrued Colocation And Bandwidth Costs AccruedColocationAndBandwidthCosts	14684000	usd
CY2023Q4	fsly	Accrued Colocation And Bandwidth Costs AccruedColocationAndBandwidthCosts	14362000	usd
CY2024Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	4003000	usd
CY2023Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	4344000	usd
CY2024Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	3231000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	3580000	usd
CY2024Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	40854000	usd
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	61818000	usd
CY2024Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	29716000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	33824000	usd
CY2024Q3	fsly	Accrued Computer And Networking Equipment AccruedComputerAndNetworkingEquipment	1741000	usd
CY2023Q4	fsly	Accrued Computer And Networking Equipment AccruedComputerAndNetworkingEquipment	1673000	usd
CY2024Q3	fsly	Business Combination Consideration Transferred Holdback Current BusinessCombinationConsiderationTransferredHoldbackCurrent	0	usd
CY2023Q4	fsly	Business Combination Consideration Transferred Holdback Current BusinessCombinationConsiderationTransferredHoldbackCurrent	3771000	usd
CY2024Q3	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	1804000	usd
CY2023Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	1271000	usd
CY2024Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	33261000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	40539000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	260000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1218000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	986000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7352000	usd
CY2024Q3	us-gaap	Sublease Income SubleaseIncome	400000	usd
CY2023Q3	us-gaap	Sublease Income SubleaseIncome	400000	usd
	us-gaap	Sublease Income SubleaseIncome	1100000	usd
	us-gaap	Sublease Income SubleaseIncome	1000000.0	usd
CY2024Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	6466000	usd
CY2023Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	6466000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	19904000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	20499000	usd
CY2024Q3	us-gaap	Variable Lease Cost VariableLeaseCost	4183000	usd
CY2023Q3	us-gaap	Variable Lease Cost VariableLeaseCost	4024000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	12411000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	11391000	usd
CY2024Q3	fsly	Operating Variable And Short Term Lease Costs OperatingVariableAndShortTermLeaseCosts	10649000	usd
CY2023Q3	fsly	Operating Variable And Short Term Lease Costs OperatingVariableAndShortTermLeaseCosts	10490000	usd
	fsly	Operating Variable And Short Term Lease Costs OperatingVariableAndShortTermLeaseCosts	32315000	usd
	fsly	Operating Variable And Short Term Lease Costs OperatingVariableAndShortTermLeaseCosts	31890000	usd
CY2024Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3294000	usd
CY2023Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3544000	usd
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	10329000	usd
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	10786000	usd
CY2024Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	70000	usd
CY2023Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	297000	usd
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	342000	usd
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1103000	usd
CY2024Q3	fsly	Finance Lease Cost FinanceLeaseCost	3364000	usd
CY2023Q3	fsly	Finance Lease Cost FinanceLeaseCost	3841000	usd
	fsly	Finance Lease Cost FinanceLeaseCost	10671000	usd
	fsly	Finance Lease Cost FinanceLeaseCost	11889000	usd
CY2024Q3	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	400000	usd
	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1700000	usd
	fsly	Operating Lease Impairment Loss Office Facility Exit Costs OperatingLeaseImpairmentLossOfficeFacilityExitCosts	1300000	usd
	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	0	usd
CY2023Q3	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	0	usd
CY2024Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y3D
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y5M23D
CY2024Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P0Y5M26D
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y
CY2024Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0632
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0603
CY2024Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0466
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0467
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	8516000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	3319000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	24990000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	1618000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	21806000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	0	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	12502000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3128000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	usd
CY2024Q3	fsly	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	1971000	usd
CY2024Q3	fsly	Finance Lease Liability To Be Paid After Year Four FinanceLeaseLiabilityToBePaidAfterYearFour	0	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	72913000	usd
CY2024Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	4937000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6297000	usd
CY2024Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	51000	usd
CY2024Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	66616000	usd
CY2024Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	4886000	usd
CY2024Q3	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	2200000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Lease Not Yet Commenced Term Of Contract1 LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1	P3Y
CY2023Q4	us-gaap	Goodwill Goodwill	670400000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	670400000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	128884000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	81108000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	47776000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	128884000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	66409000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	62475000	usd
CY2024Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4900000	usd
CY2023Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5200000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14700000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	15500000	usd
CY2023Q3	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	usd
	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	usd
CY2024Q3	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	usd
	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	usd
	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	usd
CY2024Q3	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	usd
CY2023Q3	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	usd
	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	4900000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	16976000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	9193000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	9051000	usd
CY2024Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	6891000	usd
CY2024Q3	fsly	Finite Lived Intangible Assets Amortization Expense After Year Four FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour	765000	usd
CY2024Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	400000	usd
CY2023Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	600000	usd
	us-gaap	Interest Expense Debt InterestExpenseDebt	1200000	usd
	us-gaap	Interest Expense Debt InterestExpenseDebt	2200000	usd
CY2024Q3	us-gaap	Notes Payable Fair Value Disclosure NotesPayableFairValueDisclosure	317000000	usd
CY2023Q4	us-gaap	Notes Payable Fair Value Disclosure NotesPayableFairValueDisclosure	301400000	usd
CY2024Q3	us-gaap	Purchase Obligation Future Minimum Payments Remainder Of Fiscal Year PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear	17218000	usd
CY2024Q3	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	28153000	usd
CY2024Q3	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	13504000	usd
CY2024Q3	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	154000	usd
CY2024Q3	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	70000	usd
CY2024Q3	fsly	Purchase Obligation Due After Fourth Year PurchaseObligationDueAfterFourthYear	18000	usd
CY2024Q3	us-gaap	Purchase Obligation PurchaseObligation	59117000	usd
CY2024Q3	us-gaap	Sales And Excise Tax Payable Current And Noncurrent SalesAndExciseTaxPayableCurrentAndNoncurrent	4000000	usd
CY2023Q4	us-gaap	Sales And Excise Tax Payable Current And Noncurrent SalesAndExciseTaxPayableCurrentAndNoncurrent	4300000	usd
	fsly	Number Of Equity Incentive Plans NumberOfEquityIncentivePlans	4	plan
CY2024Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	140100000	shares
CY2024Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	140100000	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	133000000.0	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	133000000.0	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2710000	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	8.14
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y1M6D
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	26383000	usd
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	125000	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	2.48
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	33000	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	11.92
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2552000	shares
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	8.38
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y2M12D
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	5466000	usd
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	2100000	shares
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice	6.63
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1	P3Y2M12D
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue	5466000	usd
	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	500000	shares
	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	700000	shares
CY2024Q3	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	0	shares
CY2023Q3	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	0	shares
CY2024Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25016000	usd
CY2023Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	35713000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	82985000	usd
CY2024Q3	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2500000	usd
CY2023Q3	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3700000	usd
CY2024Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-38016000	usd
CY2024Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-38016000	usd
CY2023Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-54311000	usd
CY2023Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-54311000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-125172000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-109702000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-109702000	usd
CY2024Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	139237000	shares
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	139237000	shares
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	129873000	shares
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	129873000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	137097000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	137097000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	127735000	shares
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.27
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.27
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.42
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.91
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.86
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.86
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	22707000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	22415000	shares
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	500000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	200000	usd
CY2024Q3	fsly	Property Plant And Equipment Net And Operating Lease Right Of Use Assets Net PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssetsNet	227988000	usd
CY2023Q4	fsly	Property Plant And Equipment Net And Operating Lease Right Of Use Assets Net PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssetsNet	231820000	usd
CY2024Q3	us-gaap	Restructuring Charges RestructuringCharges	9700000	usd
	us-gaap	Restructuring Charges RestructuringCharges	9700000	usd
CY2024Q2	us-gaap	Restructuring Reserve RestructuringReserve	0	usd
CY2024Q3	us-gaap	Restructuring Charges RestructuringCharges	9720000	usd
CY2024Q3	us-gaap	Payments For Restructuring PaymentsForRestructuring	5070000	usd
CY2024Q3	us-gaap	Restructuring Reserve RestructuringReserve	4650000	usd
CY2024Q3	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2024Q3	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false

Files In Submission

Name	View Source	Status
0001517413-24-000216-index-headers.html	Edgar Link	pending
0001517413-24-000216-index.html	Edgar Link	pending
0001517413-24-000216.txt	Edgar Link	pending
0001517413-24-000216-xbrl.zip	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
fsly-20240930.htm	Edgar Link	pending
fsly-20240930.xsd	Edgar Link	pending
fsly-93024x10qexhibit311.htm	Edgar Link	pending
fsly-93024x10qexhibit312.htm	Edgar Link	pending
fsly-93024x10qexhibit321.htm	Edgar Link	pending
fsly-93024x10qexhibit322.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
fsly-20240930_cal.xml	Edgar Link	unprocessable
fsly-20240930_lab.xml	Edgar Link	unprocessable
fsly-20240930_pre.xml	Edgar Link	unprocessable
fsly-20240930_htm.xml	Edgar Link	completed
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
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R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
fsly-20240930_def.xml	Edgar Link	unprocessable

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$FSLY
Fastly, Inc. Stock $fsly

2024 Q4 Form 10-Q Financial Statement

#000151741324000216 Filed on November 07, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSLY Fastly, Inc. Stock $fsly

2024 Q4 Form 10-Q Financial Statement

#000151741324000216 Filed on November 07, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSLY
Fastly, Inc. Stock $fsly