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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     $ 6,816us-gaap_RestructuringCharges $ 9,345us-gaap_RestructuringCharges $ 4,608us-gaap_RestructuringCharges                    
Maturity date     Mar. 14, 2016                        
Line of credit outstanding amount     50,904us-gaap_LineOfCredit                        
Maximum borrowing capacity under the credit agreement     73,500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity                        
Total proceeds from public offering 45,149us-gaap_StockIssuedDuringPeriodValueNewIssues 34,959us-gaap_StockIssuedDuringPeriodValueNewIssues 45,149us-gaap_StockIssuedDuringPeriodValueNewIssues 34,959us-gaap_StockIssuedDuringPeriodValueNewIssues                      
Maximum bank guarantees     40,200us-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 7,209us-gaap_NetCashProvidedByUsedInOperatingActivities                    
Cash and cash equivalents and short-term investments     42,371us-gaap_CashCashEquivalentsAndShortTermInvestments                        
Restructuring plan 2012 [Member]                              
General [Line Items]                              
Restructuring costs         4,608us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2012Member		                    
Restructuring reserve     0us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2012Member		 206us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2012Member		                      
Restructuring plan 2013 [Member]                              
General [Line Items]                              
Restructuring costs     978us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2013Member		 9,345us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2013Member		                      
Restructuring reserve     501us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2013Member		 5,375us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2013Member		                      
Restructuring plan 2014 [Member]                              
General [Line Items]                              
Restructuring costs     5,838us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= crnt_RestructuringPlan2014Member		                        
Restructuring reserve     2,427us-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     2,475crnt_CashShortTermBankDepositAndMarketableSecurities
/ us-gaap_StatementGeographicalAxis
= crnt_SegmentGeographicalGroupsOfCountriesGroupFiveMember		                        
Elteck ASA [Member]                              
General [Line Items]                              
Proceed from previous acquisition, net of associated legal expenses           16,800us-gaap_ProceedsFromPreviousAcquisition
/ dei_LegalEntityAxis
= crnt_ElteckAsaMember		                  
Nera Networks [Member]                              
General [Line Items]                              
Consideration for all shares             57,175us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1
/ us-gaap_BusinessAcquisitionAxis
= crnt_NeraNetworksMember		                
Credit Agreement [Member]                              
General [Line Items]                              
Maximum borrowing capacity under the credit agreement     73,500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember		                        
Credit Agreement [Member] | Minimum [Member]                              
General [Line Items]                              
Cash covenant amount     20,000crnt_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                   2,000crnt_LineOfCreditReduction
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 4,000crnt_LineOfCreditReduction
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 5,000crnt_LineOfCreditReduction
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 2,500crnt_LineOfCreditReduction
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 5,000crnt_LineOfCreditReduction
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 5,000crnt_LineOfCreditReduction
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Increase amount of accounts receivable                 34,000crnt_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                       54,000crnt_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                       $ 15,000crnt_LineOfCreditFacilityCashCovenantAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember