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REVENUES (Schedule of Significant Changes in Deferred Revenue) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Revenues [Abstract] |
Balance, beginning of the period | $ 5,193
New performance obligations | 12,746
Reclassification to revenue as a result of satisfying performance obligations | (14,066)
Balance, end of the period | $ 3,873

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- Definition Deferred revenues, current. + References No definition available. + Details
Name: | crnt_DeferredRevenues
Namespace Prefix: | crnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reclassification to revenue as a result of satisfying performance obligations. + References No definition available. + Details
Name: | crnt_ReclassificationToRevenueAsResultOfSatisfyingPerformanceObligations
Namespace Prefix: | crnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RevenuesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration