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General (Narratives) (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 8 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2014 | Nov. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2014 | Jan. 19, 2011 | Mar. 31, 2015 | Oct. 30, 2015 | Feb. 28, 2016 | Jan. 01, 2016 | Oct. 01, 2015 | Jul. 01, 2015 | Apr. 01, 2015 | Jan. 01, 2015
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  | $ 6,816 us-gaap_RestructuringCharges | $ 9,345 us-gaap_RestructuringCharges | $ 4,608 us-gaap_RestructuringCharges |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Mar. 14, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit outstanding amount |  |  | 50,904 us-gaap_LineOfCredit |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit agreement |  |  | 73,500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |  |  |  |  |  |  |  |  |
Total proceeds from public offering | 45,149 us-gaap_StockIssuedDuringPeriodValueNewIssues | 34,959 us-gaap_StockIssuedDuringPeriodValueNewIssues | 45,149 us-gaap_StockIssuedDuringPeriodValueNewIssues | 34,959 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  |  |  |  |  |
Maximum bank guarantees |  |  | 40,200 us-gaap_GuaranteeObligationsMaximumExposure |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (76,479)us-gaap_NetIncomeLoss | (47,478)us-gaap_NetIncomeLoss | (23,391)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  | (32,279)us-gaap_NetCashProvidedByUsedInOperatingActivities | (29,512)us-gaap_NetCashProvidedByUsedInOperatingActivities | 7,209 us-gaap_NetCashProvidedByUsedInOperatingActivities |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents and short-term investments |  |  | 42,371 us-gaap_CashCashEquivalentsAndShortTermInvestments |  |  |  |  |  |  |  |  |  |  |  |
Restructuring plan 2012 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  | 4,608 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2012Member |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2012Member | 206 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2012Member |  |  |  |  |  |  |  |  |  |  |
Restructuring plan 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  | 978 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2013Member | 9,345 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2013Member |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  | 501 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2013Member | 5,375 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2013Member |  |  |  |  |  |  |  |  |  |  |
Restructuring plan 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  | 5,838 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2014Member |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  | 2,427 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = crnt_RestructuringPlan2014Member |  |  |  |  |  |  |  |  |  |  |  |
Venezuela and Argentina [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, short-term bank deposits and short and long-term marketable securities |  |  | 2,475 crnt_CashShortTermBankDepositAndMarketableSecurities / us-gaap_StatementGeographicalAxis = crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember |  |  |  |  |  |  |  |  |  |  |  |
Elteck ASA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceed from previous acquisition, net of associated legal expenses |  |  |  |  |  | 16,800 us-gaap_ProceedsFromPreviousAcquisition / dei_LegalEntityAxis = crnt_ElteckAsaMember |  |  |  |  |  |  |  |  |
Nera Networks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for all shares |  |  |  |  |  |  | 57,175 us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1 / us-gaap_BusinessAcquisitionAxis = crnt_NeraNetworksMember |  |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit agreement |  |  | 73,500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash covenant amount |  |  | 20,000 crnt_LineOfCreditFacilityCashCovenantAmount / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity 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
Increase amount of accounts receivable |  |  |  |  |  |  |  |  | 34,000 crnt_LineOfCreditFacilityIncreaseDecreaseInAccountsReceivable / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Credit Agreement [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term accounts receivable amount |  |  |  |  |  |  |  |  |  |  |  | 54,000 crnt_LineOfCreditFacilityLongTermAccountsReceivables / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Credit Agreement [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash covenant amount |  |  |  |  |  |  |  |  |  |  |  | $ 15,000 crnt_LineOfCreditFacilityCashCovenantAmount / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |

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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- 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
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