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SELECTED STATEMENTS OF OPERATIONS DATA (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Quarterly Financial Data [Abstract]
Income (loss) resulting from devaluation of the local currency in Venezuela	$ 969

X

- Definition

Represents the amount of foreign currency transaction remeasurement gain (loss) recognized in the income statement.

+ References

No definition available.

+ Details

Name:	crnt_ForeignCurrencyTransactionRemeasurementGainLoss
Namespace Prefix:	crnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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