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DERIVATIVE INSTRUMENTS (Schedule Of Derivative Instruments) (Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives designated as hedging instruments [Member] | Foreign exchange forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other account receivables and prepaid expenses		$ 303
Other account payables and accrued expenses	(875)
Other comprehensive income (loss)	(875)	303
Derivatives not designated as hedging instruments [Member] | Foreign exchange forward contracts and other derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other account receivables and prepaid expenses	216	148
Other account payables and accrued expenses	$ (260)	$ (457)

X

- Definition

Other comprehensive income (loss).

+ References

No definition available.

+ Details

Name:	crnt_DerivativeInstrumentOtherComprehensiveIncomeLoss
Namespace Prefix:	crnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other account payables and accrued expenses.

+ References

No definition available.

+ Details

Name:	crnt_DerivativeInstrumentsOtherAccountPayablesAndAccruedExpenses
Namespace Prefix:	crnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other account receivables and prepaid expenses.

+ References

No definition available.

+ Details

Name:	crnt_DerivativeInstrumentsOtherAccountReceivablesAndPrepaidExpenses
Namespace Prefix:	crnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=crnt_ForeignExchangeForwardContractsAndOtherDerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: