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Significant Accounting Policies (Schedule Of Stock Option Granted Assumptions) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Abstract]      
Dividend yield 0.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate 0.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate 0.00%us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedDividendRate
Volatility, minimum 49.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum 41.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum 40.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
Volatility, maximum 65.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum 56.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum 64.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
Risk free interest, minimum 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
Risk free interest, maximum 2.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum 2.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum 2.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
Early exercise multiple, minimum 2.20crnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEarlyExerciseMultipleMinimum 1.60crnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEarlyExerciseMultipleMinimum 1.55crnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEarlyExerciseMultipleMinimum
Early exercise multiple, maximum 2.80crnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEarlyExerciseMultipleMaximum 1.90crnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEarlyExerciseMultipleMaximum 1.85crnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEarlyExerciseMultipleMaximum