Debt Instrument Basis Spread On Variable Rate Update Period

No definition available.

Name:	crnt_DebtInstrumentBasisSpreadOnVariableRateUpdatePeriod
Namespace Prefix:	crnt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Number Of Quarterly Repayments

+ References

No definition available.

+ Details

Name:	crnt_DebtInstrumentNumberOfQuarterlyRepayments
Namespace Prefix:	crnt_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the line of credit covenant related to allowed discounting activities of the entity's main Indian customer long-term receivables.

+ References

No definition available.

+ Details

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

- Definition

Represents the line of credit covenant related to the minimum total shareholders' equity.

+ References

No definition available.

+ Details

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

- Definition

Represents the line of credit covenant related to the reduction of the minimum total shareholders' equity total assets ratio.

+ References

No definition available.

+ Details

Name:	crnt_LineOfCreditFacilityCovenantRelatedToReductionOfMinimumTotalShareholdersEquityTotalAssetsRatio
Namespace Prefix:	crnt_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the line of credit maximum borrowing capacity after reduction.

+ References

No definition available.

+ Details

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

- Definition

Represents the line of credit maximum borrowing capacity before the start of gradual reduction.

+ References

No definition available.

+ Details

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

- Definition

Represents the line of credit minimum cash covenant after reduction.

+ References

No definition available.

+ Details

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

- Definition

Represents the line of credit minimum cash covenant before the start of gradual reduction.

+ References

No definition available.

+ Details

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

- Definition

Line of credit reduction

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e7018-107765

+ Details

Name:	us-gaap_InterestPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
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Period Type:

Loan And Credit Lines (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Mar. 31, 2015	Dec. 31, 2013	Feb. 28, 2016	Jan. 01, 2016	Oct. 01, 2015	Jul. 01, 2015	Apr. 01, 2015	Mar. 30, 2015	Jan. 01, 2015
Debt Instrument [Line Items]
Principal amount	$ 35,000us-gaap_DebtInstrumentFaceAmount
Libor spread	3.15%
Libor update period	3 months
Accrued interest	38us-gaap_InterestPayableCurrent		68us-gaap_InterestPayableCurrent
Number of quarterly debt installments	17
Maximum borrowing capacity under the credit agreement	73,500
Credit agreement, expiration date	Mar. 14, 2016
Line of credit outstanding amount	50,904us-gaap_LineOfCredit
Interest rate description	Libor+3.21% to Libor+3.4%
Maximum [Member]
Debt Instrument [Line Items]
Libor spread	3.40%
Minimum [Member]
Debt Instrument [Line Items]
Libor spread	3.21%
Bank Guarantees [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under the credit agreement	40,200
Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under the credit agreement	73,500
Credit Agreement [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit agreement, expiration date		Jun. 30, 2016
Line of credit reduction				2,000	4,000	5,000	2,500	5,000		5,000
Line of credit covenant, allowed discounting activities of the main Indian customer long-term receivables		54,000							20,000
Loan amount before start of gradual reduction		63,500
Loan amount after reduction		50,000
Minimum cash covenant before start of gradual reduction		20,000
Minimum cash covenant after reduction		15,000
Line of credit covenant, minimum total shareholders'' equity		$ 85,000
Line of credit covenant, reduction of the minimum total shareholders'' equity total assets ratio		0.27
Credit Agreement [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Libor spread		3.50%