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Related Party Balances And Transactions (Schedule Of Transaction With Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Cost of revenues	$ 4,613us-gaap_RelatedPartiesAmountInCostOfSales	$ 5,381us-gaap_RelatedPartiesAmountInCostOfSales	$ 4,974us-gaap_RelatedPartiesAmountInCostOfSales
Research And Development [Member]
Related Party Transaction [Line Items]
Expenses	1,244us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_ResearchAndDevelopmentExpenseMember	1,011us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_ResearchAndDevelopmentExpenseMember	1,032us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Selling And Marketing [Member]
Related Party Transaction [Line Items]
Expenses	914us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_SellingAndMarketingExpenseMember	1,189us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_SellingAndMarketingExpenseMember	1,233us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_SellingAndMarketingExpenseMember
General And Administrative [Member]
Related Party Transaction [Line Items]
Expenses	1,123us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_GeneralAndAdministrativeExpenseMember	798us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_GeneralAndAdministrativeExpenseMember	684us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Purchase Of Property And Equpment [Member]
Related Party Transaction [Line Items]
Expenses	$ 100us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember	$ 265us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember	$ 1,130us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_NatureOfExpenseAxis = crnt_PurchaseOfPropertyAndEqupmentMember

X

- Definition

Amount included in cost of sales related to transactions with related parties incurred and recorded in the statement of operations for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Subparagraph b

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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