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Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
Short-term bank deposits average interest rate | 0.00%crnt_ShortTermBankDepositsAverageInterestRate | 0.30%crnt_ShortTermBankDepositsAverageInterestRate |
Short-trem bank deposits restriced against bank guarantees | $ 407 crnt_ShortTremBankDepositsRestricedAgainstBankGuarantees |  |
Income tax benefit realization threshold | 50.00%crnt_IncomeTaxBenefitMoreLikelyThanNotThresholdForRealizationPercentage |  |
Accumulated capitalized computer software costs | 9,964 us-gaap_CapitalizedComputerSoftwareGross | 8,224 us-gaap_CapitalizedComputerSoftwareGross |
Period that short-trem bank deposits restriced against bank guarantees | 6 months |  |
Impairment of long-lived assets | 2,367 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 2,559 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |
Number of reporting units | 1 us-gaap_NumberOfReportingUnits |  |
Provision amount of revenue recognition | 1,012 crnt_RevenueRecognitionProvisionAmount | 550 crnt_RevenueRecognitionProvisionAmount |
Number of additional research and development grants approved | 3 crnt_NumberOfAdditionalResearchAndDevelopmentGrantsApproved |  |
Grants received | 1,760 us-gaap_RevenueFromGrants | 660 us-gaap_RevenueFromGrants |
Income from OCS grants | 1,092 crnt_IncomeLossFromOCSGrants | 599 crnt_IncomeLossFromOCSGrants | 0 crnt_IncomeLossFromOCSGrants
Warranty expense (income) | (133)us-gaap_ProductWarrantyExpense | (1,816)us-gaap_ProductWarrantyExpense | (1,753)us-gaap_ProductWarrantyExpense
Warranty provision | 2,851 us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease | 2,984 us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease |
Allowance for doubtful accounts | 8,404 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 6,519 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |
Doubtful debt expenses | 2,286 us-gaap_ProvisionForDoubtfulAccounts | 1,255 us-gaap_ProvisionForDoubtfulAccounts | 1,727 us-gaap_ProvisionForDoubtfulAccounts
Trade receivables sold | 13,061 us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds | 19,730 us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds |
Severance expense | 1,964 crnt_SeveranceExpense | 2,588 crnt_SeveranceExpense | 1,489 crnt_SeveranceExpense
Outstanding options excluded from the calculations of diluted net earnings per share due to their anti-dilutive effect | 6,895,891 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 5,996,622 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 5,743,458 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Other-than-temporary impairment on marketable securities | 3,471 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount | 2,108 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount |
Impairment of long lived assets |  |  |
Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets useful lives | 2 years |  |
Warranty period | 1 year |  |
Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets useful lives | 7 years |  |
Grants received | $ 1,760 us-gaap_RevenueFromGrants / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 660 us-gaap_RevenueFromGrants / us-gaap_RangeAxis = us-gaap_MaximumMember |
Warranty period | 3 years |  |

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- Definition Income tax benefit, more-likely-than-not threshold for realization, percentage. + References No definition available. + Details
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- Definition Short-term bank deposits average interest rate + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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- Definition This element represents the amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.M) -URI http://asc.fasb.org/extlink&oid=27011274&loc=d3e87990-122713 + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reporting Unit -URI http://asc.fasb.org/extlink&oid=6523643 + Details
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- Definition Total increases or decreases in the standard and extended product warranty liability during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3,4)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition Represents the initial fair value recorded for assets received on transfer of financial assets in a securitization, asset-backed financing arrangement, or a similar transfer which transaction is recognized as a sale of the transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b)(2)(i) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107207-111719 + Details
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