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COMMITMENTS AND CONTINGENT LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Leased Assets [Line Items]
Collateral deposit in the amount for outstanding letters of credit	$ 996
Bank guarantees	79,923	$ 34,988
Income from OCS grants	626	937
Damages sought by plaintiff	75,000	75,000
Project guarantee	29,089
Facilities [Member]
Operating Leased Assets [Line Items]
Operating lease expense	2,396	2,189
Vehicles [Member]
Operating Leased Assets [Line Items]
Operating lease expense	$ 397	$ 389

X

- Definition

Revenue generated from grants.

+ References

No definition available.

+ Details

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

X

- Definition

Project guarantee amount.

+ References

No definition available.

+ Details

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

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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-Name Accounting Standards Codification
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-SubTopic 20
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- 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.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Publisher FASB
-Name Accounting Standards Codification
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