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Significant Accounting Policies (Schedule Of Annual Depreciation Rates) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Computers, Manufacturing And Peripheral Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	6.00%crnt_DepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Computers, Manufacturing And Peripheral Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	33.00%crnt_DepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Enterprise Resource Planning Systems ("ERP") [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	10.00%crnt_DepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_EnterpriseResourcePlanningSystemsMember
Amortization	$ 990us-gaap_AdjustmentForAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_EnterpriseResourcePlanningSystemsMember	$ 394us-gaap_AdjustmentForAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_EnterpriseResourcePlanningSystemsMember
Other Furniture And Equipment [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	15.00%crnt_DepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember

X

- Definition

Depreciation rate

+ References

No definition available.

+ Details

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Namespace Prefix:	crnt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	crnt_SignificantAccountingPoliciesLineItems
Namespace Prefix:	crnt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=crnt_EnterpriseResourcePlanningSystemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OtherMachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: