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Significant Accounting Policies (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Line Items]      
Short-term bank deposits average interest rate 0.00%crnt_ShortTermBankDepositsAverageInterestRate 0.30%crnt_ShortTermBankDepositsAverageInterestRate  
Short-trem bank deposits restriced against bank guarantees $ 407crnt_ShortTremBankDepositsRestricedAgainstBankGuarantees    
Income tax benefit realization threshold 50.00%crnt_IncomeTaxBenefitMoreLikelyThanNotThresholdForRealizationPercentage    
Accumulated capitalized computer software costs 9,964us-gaap_CapitalizedComputerSoftwareGross 8,224us-gaap_CapitalizedComputerSoftwareGross  
Period that short-trem bank deposits restriced against bank guarantees 6 months    
Impairment of long-lived assets 2,367us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 2,559us-gaap_ImpairmentOfLongLivedAssetsHeldForUse   
Number of reporting units 1us-gaap_NumberOfReportingUnits    
Provision amount of revenue recognition 1,012crnt_RevenueRecognitionProvisionAmount 550crnt_RevenueRecognitionProvisionAmount  
Number of additional research and development grants approved 3crnt_NumberOfAdditionalResearchAndDevelopmentGrantsApproved    
Grants received 1,760us-gaap_RevenueFromGrants 660us-gaap_RevenueFromGrants  
Income from OCS grants 1,092crnt_IncomeLossFromOCSGrants 599crnt_IncomeLossFromOCSGrants 0crnt_IncomeLossFromOCSGrants
Warranty expense (income) (133)us-gaap_ProductWarrantyExpense (1,816)us-gaap_ProductWarrantyExpense (1,753)us-gaap_ProductWarrantyExpense
Warranty provision 2,851us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease 2,984us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease  
Allowance for doubtful accounts 8,404us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 6,519us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent  
Doubtful debt expenses 2,286us-gaap_ProvisionForDoubtfulAccounts 1,255us-gaap_ProvisionForDoubtfulAccounts 1,727us-gaap_ProvisionForDoubtfulAccounts
Trade receivables sold 13,061us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds 19,730us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds  
Severance expense 1,964crnt_SeveranceExpense 2,588crnt_SeveranceExpense 1,489crnt_SeveranceExpense
Outstanding options excluded from the calculations of diluted net earnings per share due to their anti-dilutive effect 6,895,891us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,996,622us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,743,458us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Other-than-temporary impairment on marketable securities 3,471us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount 2,108us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount   
Impairment of long lived assets        
Minimum [Member]      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives 2 years    
Warranty period 1 year    
Maximum [Member]      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives 7 years    
Grants received $ 1,760us-gaap_RevenueFromGrants
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 660us-gaap_RevenueFromGrants
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Warranty period 3 years