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Summary of Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Income before income taxes	14,466us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	7,955us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	7,637us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Theoretical income tax expense	3,833us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1,989us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1,909us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Utilization of tax losses and deferred taxes for which valuation allowance was provided, net	(143)cybr_EffectiveIncomeTaxRateReconciliationUtilizationOfTaxLossesAndDeferredTaxesForWhichValuationAllowanceProvidedNetAmount	4cybr_EffectiveIncomeTaxRateReconciliationUtilizationOfTaxLossesAndDeferredTaxesForWhichValuationAllowanceProvidedNetAmount	2cybr_EffectiveIncomeTaxRateReconciliationUtilizationOfTaxLossesAndDeferredTaxesForWhichValuationAllowanceProvidedNetAmount
Deferred taxes on losses for which valuation allowance was provided, net	834us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(91)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(457)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Non-deductible expenses	1,165us-gaap_IncomeTaxReconciliationNondeductibleExpense	251us-gaap_IncomeTaxReconciliationNondeductibleExpense	23us-gaap_IncomeTaxReconciliationNondeductibleExpense
Increase in other uncertain tax positions-net	19us-gaap_IncomeTaxReconciliationTaxContingencies	175us-gaap_IncomeTaxReconciliationTaxContingencies
Tax adjustment in respect of different tax rate	(838)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(979)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(1,737)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Other	(358)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(29)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	35us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense (benefit)	4,512us-gaap_IncomeTaxExpenseBenefit	1,320us-gaap_IncomeTaxExpenseBenefit	(225)us-gaap_IncomeTaxExpenseBenefit
Israel Tax Authority
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Statutory tax rate	26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_IsraelTaxAuthorityMember	25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_IsraelTaxAuthorityMember	25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_IsraelTaxAuthorityMember	24.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_IsraelTaxAuthorityMember

X

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Amount of the difference between reported income tax expense and expected income tax expense computed by applying the statutory income tax rates to pretax income (loss) from continuing operations attributable to utilization of tax losses and deferred taxes for which valuation allowance was provided.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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