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Property And Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Cost	$ 85,780us-gaap_PropertyPlantAndEquipmentGross	$ 80,288us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	52,642us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	45,043us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Depreciated cost	33,138us-gaap_PropertyPlantAndEquipmentNet	35,245us-gaap_PropertyPlantAndEquipmentNet
Depreciation expenses	11,377us-gaap_Depreciation	13,111us-gaap_Depreciation	11,493us-gaap_Depreciation
Impairment of long-lived assets related to restructuring plan	2,367us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	2,559us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Changes of property and equipment	(982)us-gaap_CapitalExpendituresIncurredButNotYetPaid	946us-gaap_CapitalExpendituresIncurredButNotYetPaid
Computers, Manufacturing, Peripheral Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	81,855us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_ComputersManufacturingPeripheralEquipmentMember	75,337us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_ComputersManufacturingPeripheralEquipmentMember
Accumulated depreciation	50,271us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_ComputersManufacturingPeripheralEquipmentMember	42,091us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_ComputersManufacturingPeripheralEquipmentMember
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	2,876us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember	3,516us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember
Accumulated depreciation	1,616us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember	1,898us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	1,049us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember	1,435us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Accumulated depreciation	$ 755us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember	$ 1,054us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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