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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |  |  |
Net loss | $ (76,479)us-gaap_NetIncomeLoss |  | $ (47,478)us-gaap_NetIncomeLoss |  | $ (23,391)us-gaap_NetIncomeLoss
Adjustments required to reconcile net loss to net cash provided by (used in) operating activities: |  |  |  |  |
Depreciation and amortization | 13,498 us-gaap_DepreciationAndAmortization |  | 15,645 us-gaap_DepreciationAndAmortization |  | 15,030 us-gaap_DepreciationAndAmortization
Share-based compensation expense | 3,345 us-gaap_ShareBasedCompensation |  | 3,822 us-gaap_ShareBasedCompensation |  | 5,460 us-gaap_ShareBasedCompensation
Impairment of long-lived assets | 2,367 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  | 2,559 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |
Impairment of goodwill | 14,765 us-gaap_GoodwillImpairmentLoss | [1] |  | [1] |
Other than temporary impairment of marketable securities | 3,471 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet |  | 2,108 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet |  |
Accrued severance pay and pensions, net | (787)us-gaap_SeveranceCosts1 |  | 1,422 us-gaap_SeveranceCosts1 |  | (488)us-gaap_SeveranceCosts1
Decrease in accrued interest and exchange rate on bank deposits |  |  |  |  | 84 us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet
Accrued interest and amortization of premium on marketable securities |  |  | (40)crnt_AccruedInterestAndAmortizationOfPremiumOnMarketableSecurities |  | (323)crnt_AccruedInterestAndAmortizationOfPremiumOnMarketableSecurities
Decrease (increase) in trade receivables, net | (33,876)us-gaap_IncreaseDecreaseInAccountsReceivable |  | 15,505 us-gaap_IncreaseDecreaseInAccountsReceivable |  | (9,459)us-gaap_IncreaseDecreaseInAccountsReceivable
Decrease (increase) in other accounts receivable and prepaid expenses | 11,283 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets |  | 2,767 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets |  | (2,294)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Decrease in inventories | 1,792 us-gaap_IncreaseDecreaseInInventories |  | 401 us-gaap_IncreaseDecreaseInInventories |  | 27,210 us-gaap_IncreaseDecreaseInInventories
Increase (decrease) in trade payables | 25,155 us-gaap_IncreaseDecreaseInAccountsPayable |  | (24,067)us-gaap_IncreaseDecreaseInAccountsPayable |  | 24,986 us-gaap_IncreaseDecreaseInAccountsPayable
Increase (decrease) in deferred revenues | 9,699 us-gaap_IncreaseDecreaseInDeferredRevenue |  | (8,751)us-gaap_IncreaseDecreaseInDeferredRevenue |  | (21,589)us-gaap_IncreaseDecreaseInDeferredRevenue
Decrease (increase) in deferred tax asset, net | 9,788 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes |  | 3,572 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes |  | (743)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Increase (decrease) in other accounts payable and accrued expenses (including other long term liabilities) | (16,300)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities |  | 3,023 us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities |  | (7,274)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Net cash provided by (used in) operating activities | (32,279)us-gaap_NetCashProvidedByUsedInOperatingActivities |  | (29,512)us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 7,209 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |  |  |  |
Purchase of property and equipment | (12,691)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | (16,423)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | (14,530)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Investment in short-term bank deposits | (36)us-gaap_PaymentsToAcquireShortTermInvestments |  | (679)us-gaap_PaymentsToAcquireShortTermInvestments |  | (1,266)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from maturities of short-term bank deposits | 69 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments |  | 635 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments |  | 7,920 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments
Investment in marketable securities |  |  | (7,867)us-gaap_PaymentsToAcquireMarketableSecurities |  | (64)us-gaap_PaymentsToAcquireMarketableSecurities
Proceeds from sale of marketable securities | 5,161 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  | 513 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  | 9,781 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Net cash provided by (used in) investing activities | (7,497)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (23,821)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | 1,841 us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |  |  |  |
Proceeds and loans from financial institutions | 22,691 us-gaap_ProceedsFromLoans |  | 23,690 us-gaap_ProceedsFromLoans |  | 27,000 us-gaap_ProceedsFromLoans
Repayment of bank loan | (29,012)us-gaap_RepaymentsOfBankDebt |  | (10,234)us-gaap_RepaymentsOfBankDebt |  | (18,232)us-gaap_RepaymentsOfBankDebt
Proceeds from issuance of shares, net | 45,149 us-gaap_ProceedsFromIssuanceOfCommonStock |  | 34,959 us-gaap_ProceedsFromIssuanceOfCommonStock |  |
Proceeds from exercise of options |  |  | 1,145 us-gaap_ProceedsFromStockOptionsExercised |  | 736 us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities | 38,828 us-gaap_NetCashProvidedByUsedInFinancingActivities |  | 49,560 us-gaap_NetCashProvidedByUsedInFinancingActivities |  | 9,504 us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash | (36)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |  | (919)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |  | (446)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase (decrease) in cash and cash equivalents | (984)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | (4,692)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | 18,108 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the year | 42,407 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 47,099 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 28,991 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of the year | 41,423 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 42,407 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 47,099 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information: |  |  |  |  |
Cash paid during the year for income taxes | 2,572 us-gaap_IncomeTaxesPaidNet |  | 1,778 us-gaap_IncomeTaxesPaidNet |  | 2,326 us-gaap_IncomeTaxesPaidNet
Cash paid during the year for interest | $ 3,541 us-gaap_InterestPaid |  | $ 2,597 us-gaap_InterestPaid |  | $ 2,113 us-gaap_InterestPaid
[1] | During the fourth quarter of 2014, the Company determined that sufficient indicators of potential impairment existed to require additional goodwill impairment analysis. These indicators included the trading value of the Company's stock at the time of the impairment test, coupled with existing market conditions and business trends. Based on the step one and step two analyses (see also note 2l), the Company recorded complete goodwill impairment charge in 2014, in the amount of $ 14,765.

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
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- Definition Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Cash received from principal payments made on loans related to operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash inflow from maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow to settle a bank borrowing during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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 + Details
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