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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 | $ 35,000 us-gaap_DebtInstrumentFaceAmount |  |  |  |  |  |  |  |  |
Libor spread | 3.15%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 |  |  |  |  |  |  |  |  |
Libor update period | 3 months |  |  |  |  |  |  |  |  |
Accrued interest | 38 us-gaap_InterestPayableCurrent |  | 68 us-gaap_InterestPayableCurrent |  |  |  |  |  |  |
Number of quarterly debt installments | 17 crnt_DebtInstrumentNumberOfQuarterlyRepayments |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit agreement | 73,500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |  |  |  |  |  |
Credit agreement, expiration date | Mar. 14, 2016 |  |  |  |  |  |  |  |  |
Line of credit outstanding amount | 50,904 us-gaap_LineOfCredit |  |  |  |  |  |  |  |  |
Interest rate description | L ibor+3.21% to L ibor+3.4% |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Libor spread | 3.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Libor spread | 3.21%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |
Bank Guarantees [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit agreement | 40,200 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |  |  |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit agreement | 73,500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit agreement, expiration date |  | Jun. 30, 2016 |  |  |  |  |  |  |  |
Line of credit reduction |  |  |  | 2,000 crnt_LineOfCreditReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 4,000 crnt_LineOfCreditReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 5,000 crnt_LineOfCreditReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 2,500 crnt_LineOfCreditReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 5,000 crnt_LineOfCreditReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  | 5,000 crnt_LineOfCreditReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of credit covenant, allowed discounting activities of the main Indian customer long-term receivables |  | 54,000 crnt_LineOfCreditFacilityCovenantRelatedToAllowedDiscountingActivitiesOfMainIndianCustomerLongTermReceivables / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  | 20,000 crnt_LineOfCreditFacilityCovenantRelatedToAllowedDiscountingActivitiesOfMainIndianCustomerLongTermReceivables / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Loan amount before start of gradual reduction |  | 63,500 crnt_LineOfCreditFacilityMaximumBorrowingCapacityBeforeStartOfGradualReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |
Loan amount after reduction |  | 50,000 crnt_LineOfCreditFacilityMaximumBorrowingCapacityAfterReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |
Minimum cash covenant before start of gradual reduction |  | 20,000 crnt_LineOfCreditFacilityMinimumCashCovenantBeforeStartOfGradualReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |
Minimum cash covenant after reduction |  | 15,000 crnt_LineOfCreditFacilityMinimumCashCovenantAfterReduction / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |
Line of credit covenant, minimum total shareholders'' equity |  | $ 85,000 crnt_LineOfCreditFacilityCovenantRelatedToMinimumTotalShareholdersEquity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |
Line of credit covenant, reduction of the minimum total shareholders'' equity total assets ratio |  | 0.27 crnt_LineOfCreditFacilityCovenantRelatedToReductionOfMinimumTotalShareholdersEquityTotalAssetsRatio / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |
Credit Agreement [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Libor spread |  | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |

X
- Definition Debt Instrument Basis Spread On Variable Rate Update Period + References No definition available. + Details
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Namespace Prefix: | crnt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument Number Of Quarterly Repayments + References No definition available. + Details
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Namespace Prefix: | crnt_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- 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

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- 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

X
- 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

X
- 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 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_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
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Period Type: |

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- Details
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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
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Period Type: |

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- Details
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