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Intangible Assets, Net (Schedule Of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Original amount $ 17,423us-gaap_FiniteLivedIntangibleAssetsGross $ 17,445us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated amortization 12,353us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 10,232us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Intangible assets, net 5,070us-gaap_FiniteLivedIntangibleAssetsNet 7,213us-gaap_FiniteLivedIntangibleAssetsNet  
Amortization expense 2,121us-gaap_AmortizationOfIntangibleAssets 2,534us-gaap_AmortizationOfIntangibleAssets 3,537us-gaap_AmortizationOfIntangibleAssets
Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original amount 8,600us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= crnt_TechnologyMember
8,600us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= crnt_TechnologyMember
 
Accumulated amortization 4,854us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= crnt_TechnologyMember
3,625us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= crnt_TechnologyMember
 
Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original amount 800us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
800us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
 
Accumulated amortization 800us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
800us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
 
Useful lives 2 years    
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original amount 8,023us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
[1] 8,045us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
[1]  
Accumulated amortization $ 6,699us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
$ 5,807us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
[1] Including functional currency translation adjustments related to Brazilian subsidiary.