$TENB
Tenable Holdings Inc Stock $tenb

$tenb Overview Financials Valuation SEC Filings Company Website

2019 Q1 Form 10-K Financial Statement

#000166028019000012 Filed on March 01, 2019

Income Statement

Concept	2019 Q1	2018 Q4	2018 Q3
Revenue	$80.30M	$75.22M	$69.44M
YoY Change	35.86%	39.0%	41.77%
Cost Of Revenue	$13.23M	$12.40M	$12.16M
YoY Change	51.54%	47.99%	63.81%
Gross Profit	$67.08M	$62.82M	$57.28M
YoY Change	33.14%	37.35%	37.84%
Gross Profit Margin	83.53%	83.52%	82.49%
Selling, General & Admin	$67.83M	$61.24M	$57.82M
YoY Change	39.43%	46.77%	56.92%
% of Gross Profit	101.12%	97.49%	100.95%
Research & Development	$21.94M	$21.17M	$20.55M
YoY Change	27.64%	35.41%	29.52%
% of Gross Profit	32.7%	33.7%	35.88%
Depreciation & Amortization	$1.622M	$1.610M	$1.400M
YoY Change	11.55%	17.52%	27.27%
% of Gross Profit	2.42%	2.56%	2.44%
Operating Expenses	$89.76M	$82.41M	$78.38M
YoY Change	36.36%	43.67%	48.67%
Operating Profit	-$22.69M	-$19.59M	-$21.10M
YoY Change	46.84%	68.55%	89.0%
Interest Expense	$1.600M
YoY Change
% of Operating Profit
Other Income/Expense, Net	-$214.0K	$1.184M	$709.0K
YoY Change	2575.0%	-4653.85%	-870.65%
Pretax Income	-$21.30M	-$18.40M	-$20.40M
YoY Change	37.42%	58.62%	80.53%
Income Tax	$97.00K	$1.207M	$482.0K
% Of Pretax Income
Net Earnings	-$21.44M	-$19.61M	-$20.87M
YoY Change	34.94%	68.09%	84.47%
Net Earnings / Revenue	-26.7%	-26.08%	-30.05%
Basic Earnings Per Share
Diluted Earnings Per Share	-$228.4K	-$194.8K	-$224.5K
COMMON SHARES
Basic Shares Outstanding	94.96M shares	93.06M shares	93.03M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2019 Q1	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$299.0M	$283.2M	$287.2M
YoY Change	1032.58%
Cash & Equivalents	$168.0M	$165.1M	$253.0M
Short-Term Investments	$131.0M	$118.1M	$34.10M
Other Short-Term Assets	$44.40M	$45.30M	$35.10M
YoY Change	34.95%
Inventory
Prepaid Expenses
Receivables	$56.98M	$68.26M	$59.04M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$400.4M	$396.8M	$381.3M
YoY Change	291.04%	256.65%
LONG-TERM ASSETS
Property, Plant & Equipment	$12.71M	$11.35M	$10.87M
YoY Change	-12.92%	5.52%
Goodwill		$265.0K	$265.0K
YoY Change		0.0%
Intangibles		$427.0K	$578.0K
YoY Change		-58.58%
Long-Term Investments
YoY Change
Other Assets	$7.446M	$7.118M	$5.149M
YoY Change	-80.14%	0.68%
Total Long-Term Assets	$65.96M	$63.82M	$72.89M
YoY Change	23.99%	20.24%
TOTAL ASSETS
Total Short-Term Assets	$400.4M	$396.8M	$381.3M
Total Long-Term Assets	$65.96M	$63.82M	$72.89M
Total Assets	$466.4M	$460.6M	$454.2M
YoY Change	199.74%	180.29%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.287M	$171.0K	$538.0K
YoY Change	-19.56%	-49.41%
Accrued Expenses	$7.994M	$5.554M	$6.570M
YoY Change	-61.0%	13.86%
Deferred Revenue	$214.5M	$213.6M	$191.6M
YoY Change		37.93%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$250.8M	$254.3M	$220.3M
YoY Change	36.0%	41.01%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$23.10M
YoY Change	-100.0%
Other Long-Term Liabilities	$2.536M	$2.231M	$4.104M
YoY Change	-96.62%	-57.09%
Total Long-Term Liabilities	$2.536M	$2.231M	$4.104M
YoY Change	-96.75%	-57.09%
TOTAL LIABILITIES
Total Short-Term Liabilities	$250.8M	$254.3M	$220.3M
Total Long-Term Liabilities	$2.536M	$2.231M	$4.104M
Total Liabilities	$338.2M	$338.8M	$321.6M
YoY Change	28.78%	31.2%
SHAREHOLDERS EQUITY
Retained Earnings	-$487.5M	-$466.1M	-$446.5M
YoY Change		18.73%
Common Stock	$962.0K	$931.0K	$930.0K
YoY Change		278.46%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$128.2M	$121.8M	$132.6M
YoY Change
Total Liabilities & Shareholders Equity	$466.4M	$460.6M	$454.2M
YoY Change	199.74%	180.29%

Cashflow Statement

Concept	2019 Q1	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	-$21.44M	-$19.61M	-$20.87M
YoY Change	34.94%	68.09%	84.47%
Depreciation, Depletion And Amortization	$1.622M	$1.610M	$1.400M
YoY Change	11.55%	17.52%	27.27%
Cash From Operating Activities	-$874.0K	-$1.550M	-$1.760M
YoY Change	-273.41%	-71.61%	79.59%
INVESTING ACTIVITIES
Capital Expenditures	$2.306M	-$1.590M	-$1.160M
YoY Change	44.49%	40.71%	22.11%
Acquisitions
YoY Change
Other Investing Activities	-$12.17M	-$83.38M	-$34.11M
YoY Change
Cash From Investing Activities	-$14.47M	-$84.97M	-$35.27M
YoY Change	806.7%	7419.47%	3612.63%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$18.45M	-1.000M	266.6M
YoY Change	4983.47%	-2600.0%	88760.0%
NET CHANGE
Cash From Operating Activities	-$874.0K	-1.550M	-1.760M
Cash From Investing Activities	-$14.47M	-84.97M	-35.27M
Cash From Financing Activities	$18.45M	-1.000M	266.6M
Net Change In Cash	$2.850M	-87.52M	229.5M
YoY Change	-462.6%	1236.18%	-14182.82%
FREE CASH FLOW
Cash From Operating Activities	-$874.0K	-$1.550M	-$1.760M
Capital Expenditures	$2.306M	-$1.590M	-$1.160M
Free Cash Flow	-$3.180M	$40.00K	-$600.0K
YoY Change	191.21%	-100.92%	1900.0%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2018	dei	Amendment Flag AmendmentFlag	false
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CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0001660280
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	true
CY2018	dei	Entity Ex Transition Period EntityExTransitionPeriod	true
CY2018	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
CY2018Q4	dei	Entity Public Float EntityPublicFloat	687500000	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	TENABLE HOLDINGS, INC.
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CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	6105000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	8345000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	605000	USD
CY2018	tenb	Increase Decrease In Capitalized Contract Costs IncreaseDecreaseInCapitalizedContractCosts	9258000	USD
CY2017	tenb	Increase Decrease In Capitalized Contract Costs IncreaseDecreaseInCapitalizedContractCosts	20058000	USD
CY2016	tenb	Increase Decrease In Capitalized Contract Costs IncreaseDecreaseInCapitalizedContractCosts	9777000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1876000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3267000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1856000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	294000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	1922000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	825000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	11112000	USD
CY2017	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	4298000	USD
CY2016	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	10957000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	64085000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	63404000	USD
CY2016	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	44228000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	408000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	421000	USD
CY2016	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-1749000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	110000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-554000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-585000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-2559000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-6266000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-2785000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5733000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2755000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5776000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	0	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2755000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	117488000	USD
CY2016	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2016	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	2075000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-123221000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7851000	USD
CY2018	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	268531000	USD
CY2017	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	0	USD
CY2016	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	0	USD
CY2018	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	3932000	USD
CY2017	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	0	USD
CY2016	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	0	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1443000	USD
CY2017	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	306000	USD
CY2016	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	47000	USD
CY2018	tenb	Proceed From Grants ProceedFromGrants	0	USD
CY2017	tenb	Proceed From Grants ProceedFromGrants	0	USD
CY2016	tenb	Proceed From Grants ProceedFromGrants	1000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	238000	USD
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1668000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	3020000	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	495000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	75000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	385000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	85000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	264749000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2091000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1363000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1063000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-68000	USD
CY2016	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	0	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	137906000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-6998000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-9273000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	27472000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	34470000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	43743000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	165378000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	6000	USD
CY2018Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	293200000	USD
CY2018Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.73
CY2018	us-gaap	Interest Paid Net InterestPaidNet	111000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	79000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	27472000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	34470000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	1207000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	642000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	307000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	15000	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	1311000	USD
CY2016	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	527000	USD
CY2018	us-gaap	Settlement Of Asset Retirement Obligations Through Noncash Payments Amount SettlementOfAssetRetirementObligationsThroughNoncashPaymentsAmount	58000	USD
CY2017	us-gaap	Settlement Of Asset Retirement Obligations Through Noncash Payments Amount SettlementOfAssetRetirementObligationsThroughNoncashPaymentsAmount	764000	USD
CY2016	us-gaap	Settlement Of Asset Retirement Obligations Through Noncash Payments Amount SettlementOfAssetRetirementObligationsThroughNoncashPaymentsAmount	0	USD
CY2018	us-gaap	Basis Of Accounting BasisOfAccounting	Basis of PresentationThe accompanying consolidated financial statements include the accounts of Tenable Holdings, Inc. and our wholly owned subsidiaries and have been prepared in conformity with United States generally accepted accounting principles (“GAAP”). All intercompany accounts and transactions have been eliminated in consolidation.
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2018Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2018	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. These estimates include, but are not limited to, the determination of the estimated economic life of perpetual licenses for revenue recognition, the estimated period of benefit for deferred commissions, useful lives of long-lived assets, the valuation of stock-based compensation, including the estimated underlying fair value of our common stock prior to our IPO, the incremental borrowing rate for operating leases, and the valuation of deferred tax assets. We base these estimates on historical experience and on various other assumptions that we believe to be reasonable. Actual results could differ significantly from these estimates.
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1000000.0	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-100000	USD
CY2016	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-500000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	267360000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	187727000	USD
CY2018Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	124371000	USD
CY2018	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	154900000	USD
CY2017	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	106800000	USD
CY2018Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P4Y
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	300000	USD
CY2017Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	50176000	USD
CY2016Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	30118000	USD
CY2018	tenb	Capitalized Contract Cost Increase From Capitalization Of Costs CapitalizedContractCostIncreaseFromCapitalizationOfCosts	29075000	USD
CY2017	tenb	Capitalized Contract Cost Increase From Capitalization Of Costs CapitalizedContractCostIncreaseFromCapitalizationOfCosts	34632000	USD
CY2018	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	19817000	USD
CY2017	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	14574000	USD
CY2018Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	59434000	USD
CY2017Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	50176000	USD
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	2300000	USD
CY2017Q4	us-gaap	Construction Loan Noncurrent ConstructionLoanNoncurrent	1800000	USD
CY2018Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10100000	USD
CY2018Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	12300000	USD
CY2016Q3	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	2100000	USD
CY2016Q3	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	300000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	600000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	600000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	200000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	400000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	3300000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	3200000	USD
CY2016	us-gaap	Advertising Expense AdvertisingExpense	1100000	USD
CY2018	us-gaap	Capitalized Computer Software Additions CapitalizedComputerSoftwareAdditions	2400000	USD
CY2018	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-1.38
CY2018	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2018Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.071
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	24534000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	19482000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	13186000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8728000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11348000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10754000	USD
CY2018	tenb	Depreciationand Amortization Propertyand Equipment DepreciationandAmortizationPropertyandEquipment	5600000	USD
CY2017	tenb	Depreciationand Amortization Propertyand Equipment DepreciationandAmortizationPropertyandEquipment	4100000	USD
CY2016	tenb	Depreciationand Amortization Propertyand Equipment DepreciationandAmortizationPropertyandEquipment	2900000	USD
CY2017Q2	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	25000000.0	USD
CY2018	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0025
CY2018Q4	tenb	Line Of Credit Facility Amount Outstanding Requiring Covenant Compliance LineOfCreditFacilityAmountOutstandingRequiringCovenantCompliance	5000000.0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2018Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2018	tenb	Lessee Operating Lease Options To Terminate LesseeOperatingLeaseOptionsToTerminate	P3Y
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	3694000	USD
CY2018	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	614000	USD
CY2018	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	35000	USD
CY2018	us-gaap	Lease Cost LeaseCost	649000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	8504000	USD
CY2018Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4262000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	6055000	USD
CY2018Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10317000	USD
CY2018Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y1M6D
CY2018Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	14000	USD
CY2018Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	39000	USD
CY2018Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	53000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	722000	shares
CY2018	us-gaap	Operating Lease Payments OperatingLeasePayments	4313000	USD
CY2018	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	35000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1443000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1525000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	15000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	4429000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3736000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1747000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	465000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	301000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1052000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	11730000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1413000	USD
CY2018Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10317000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3600000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2500000	USD
CY2017Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	1500000	USD
CY2015Q4	tenb	Stockholders Equity Redeemable Convertible Stock Conversion Ratio StockholdersEquityRedeemableConvertibleStockConversionRatio	1
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2018Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	7.23
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	740000	shares
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	2.26
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	22875000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7760000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2532000	USD
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	47900000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7616000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	2.15
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y4M24D
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	17237000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	2800000	shares
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	4.15
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	495000	shares
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	1.00
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1567000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	585000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	2.84
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	9336000	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	2.77
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y2M12D
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	15374000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	9022000	shares
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	5.22
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1870000	shares
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	1.62
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7667000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	1915000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	3.21
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	14573000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	4.38
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y2M12D
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	77020000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	6108000	shares
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	15.17
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	9902000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	19219000	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	7.78
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	277114000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	6758000	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	3.75
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P6Y7M6D
CY2018Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	124629000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	19200000	shares
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-73955000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-41785000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-37971000	USD
CY2018	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	53669000	shares
CY2017	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	22211000	shares
CY2016	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	20974000	shares
CY2017	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-1.88
CY2016	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-1.81
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	21558000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	71542000	shares
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	64722000	shares
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1429000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-29357000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-40330000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-72586000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-11494000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	3965000	USD
CY2018	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-71157000	USD
CY2017	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-40851000	USD
CY2016	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-36365000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	140000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-71000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	58000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-80000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2306000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	898000	USD
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	359000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2364000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1044000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	208000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-873000	USD
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	635000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-873000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	635000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2364000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	171000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	843000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.340
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.340
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.015
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.024
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.049
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.019
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.030
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.022
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	-0.010
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	-0.002
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.005
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.094
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.040
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.014
CY2018	tenb	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Act Transition Tax Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActTransitionTaxPercent	0
CY2017	tenb	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Act Transition Tax Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActTransitionTaxPercent	-0.027
CY2016	tenb	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Act Transition Tax Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActTransitionTaxPercent	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.345
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.126
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.027
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.433
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.017
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.011
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.020
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.033
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.004
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.023
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	32745000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	29227000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	16488000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	14327000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5581000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	663000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	5320000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	4112000	USD
CY2018Q4	tenb	Deferred Tax Assets Leases DeferredTaxAssetsLeases	2436000	USD
CY2017Q4	tenb	Deferred Tax Assets Leases DeferredTaxAssetsLeases	567000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	697000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	415000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	68000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	37000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	63335000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	49348000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	47266000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	36403000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	16069000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	12945000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	13273000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	12306000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2166000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	367000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	353000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	277000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	272000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	16069000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	12945000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	0	USD
CY2018Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	6800000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4800000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1200000	USD
CY2017Q4	tenb	Unrecognized Tax Benefits Change In Tax Expense Benefit If Recognized UnrecognizedTaxBenefitsChangeInTaxExpenseBenefitIfRecognized	100000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1199000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	736000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	663000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3571000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	446000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	233000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	102000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	30000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	58000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	13000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	160000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4814000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1199000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	736000	USD
CY2017Q4	tenb	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Deferred Tax Asset TaxCutsAndJobsActOf2017IncompleteAccountingChangeInDeferredTaxAsset	14100000	USD
CY2017Q4	tenb	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Income TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncome	1800000	USD
CY2018	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	267360000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	187727000	USD
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	124371000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11348000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10754000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4800000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3300000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2700000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	59107000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	63592000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	69440000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	75221000	USD
CY2018Q1	us-gaap	Cost Of Revenue CostOfRevenue	8728000	USD
CY2018Q2	us-gaap	Cost Of Revenue CostOfRevenue	9879000	USD
CY2018Q3	us-gaap	Cost Of Revenue CostOfRevenue	12161000	USD
CY2018Q4	us-gaap	Cost Of Revenue CostOfRevenue	12399000	USD
CY2018Q1	us-gaap	Gross Profit GrossProfit	50379000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	53713000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	57279000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	62822000	USD
CY2018Q1	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	39588000	USD
CY2018Q2	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	41826000	USD
CY2018Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	44550000	USD
CY2018Q4	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	47380000	USD
CY2018Q1	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	17185000	USD
CY2018Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	17791000	USD
CY2018Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	20553000	USD
CY2018Q4	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	21169000	USD
CY2018Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	9055000	USD
CY2018Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	10541000	USD
CY2018Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	13272000	USD
CY2018Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	13864000	USD
CY2018Q1	us-gaap	Operating Expenses OperatingExpenses	65828000	USD
CY2018Q2	us-gaap	Operating Expenses OperatingExpenses	70158000	USD
CY2018Q3	us-gaap	Operating Expenses OperatingExpenses	78375000	USD
CY2018Q4	us-gaap	Operating Expenses OperatingExpenses	82413000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-15449000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-16445000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-21096000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-19591000	USD
CY2018Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-8000	USD
CY2018Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-461000	USD
CY2018Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	709000	USD
CY2018Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	1184000	USD
CY2018Q1	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-15457000	USD
CY2018Q2	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-16906000	USD
CY2018Q3	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-20387000	USD
CY2018Q4	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-18407000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	431000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	244000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	482000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1207000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	-15888000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	-17150000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	-20869000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	-19614000	USD
CY2018Q1	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	188000	USD
CY2018Q2	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	191000	USD
CY2018Q3	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	55000	USD
CY2018Q4	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	0	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-16076000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-17341000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-20924000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-19614000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.68
CY2018Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.73
CY2018Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.28
CY2018Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.21
CY2017Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	40481000	USD
CY2017Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	44149000	USD
CY2017Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	48980000	USD
CY2017Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	54117000	USD
CY2017Q1	us-gaap	Cost Of Revenue CostOfRevenue	4438000	USD
CY2017Q2	us-gaap	Cost Of Revenue CostOfRevenue	5348000	USD
CY2017Q3	us-gaap	Cost Of Revenue CostOfRevenue	7424000	USD
CY2017Q4	us-gaap	Cost Of Revenue CostOfRevenue	8378000	USD
CY2017Q1	us-gaap	Gross Profit GrossProfit	36043000	USD
CY2017Q2	us-gaap	Gross Profit GrossProfit	38801000	USD
CY2017Q3	us-gaap	Gross Profit GrossProfit	41556000	USD
CY2017Q4	us-gaap	Gross Profit GrossProfit	45739000	USD
CY2017Q1	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	26168000	USD
CY2017Q2	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	27773000	USD
CY2017Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	29574000	USD
CY2017Q4	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	32784000	USD
CY2017Q1	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	12458000	USD
CY2017Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	13713000	USD
CY2017Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	15869000	USD
CY2017Q4	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	15633000	USD
CY2017Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	6163000	USD
CY2017Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	6544000	USD
CY2017Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	7275000	USD
CY2017Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	8945000	USD
CY2017Q1	us-gaap	Operating Expenses OperatingExpenses	44789000	USD
CY2017Q2	us-gaap	Operating Expenses OperatingExpenses	48030000	USD
CY2017Q3	us-gaap	Operating Expenses OperatingExpenses	52718000	USD
CY2017Q4	us-gaap	Operating Expenses OperatingExpenses	57362000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-8746000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-9229000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-11162000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-11623000	USD
CY2017Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-29000	USD
CY2017Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	56000	USD
CY2017Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-92000	USD
CY2017Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-26000	USD
CY2017Q1	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-8775000	USD
CY2017Q2	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-9173000	USD
CY2017Q3	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-11254000	USD
CY2017Q4	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	-11649000	USD
CY2017Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	51000	USD
CY2017Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59000	USD
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	-8826000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	-9214000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	-11313000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	-11669000	USD
CY2017Q1	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	187000	USD
CY2017Q2	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	191000	USD
CY2017Q3	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	192000	USD
CY2017Q4	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	193000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-9013000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-9405000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-11505000	USD
CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-11862000	USD
CY2017Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.42
CY2017Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.43
CY2017Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.51
CY2017Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.52

Files In Submission

Name	View Source	Status
0001660280-19-000012-index-headers.html	Edgar Link	pending
0001660280-19-000012-index.html	Edgar Link	pending
0001660280-19-000012.txt	Edgar Link	pending
0001660280-19-000012-xbrl.zip	Edgar Link	pending
chart-b9e3a3fec9f29817898.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
q42018exhibit231.htm	Edgar Link	pending
q42018exhibit311.htm	Edgar Link	pending
q42018exhibit312.htm	Edgar Link	pending
q42018exhibit321.htm	Edgar Link	pending
q42018tenablefinancial.htm	Edgar Link	pending
q42018tenablefinancial_htm.xml	Edgar Link	completed
R1.htm	Edgar Link	pending
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R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
tenb-20181231.xsd	Edgar Link	pending
tenb-20181231_cal.xml	Edgar Link	unprocessable
tenb-20181231_def.xml	Edgar Link	unprocessable
tenb-20181231_lab.xml	Edgar Link	unprocessable
tenb-20181231_pre.xml	Edgar Link	unprocessable

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$TENB
Tenable Holdings Inc Stock $tenb

2019 Q1 Form 10-K Financial Statement

#000166028019000012 Filed on March 01, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TENB Tenable Holdings Inc Stock $tenb

2019 Q1 Form 10-K Financial Statement

#000166028019000012 Filed on March 01, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TENB
Tenable Holdings Inc Stock $tenb