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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income (loss) $ 10,496us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (10,980)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 9,546us-gaap_DepreciationDepletionAndAmortization 9,996us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes 104us-gaap_DeferredIncomeTaxExpenseBenefit 124us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation 11,718us-gaap_ShareBasedCompensation 11,638us-gaap_ShareBasedCompensation
(Gain) loss on investments, net (309)us-gaap_GainLossOnInvestments (416)us-gaap_GainLossOnInvestments
Impairment loss on equity investment in a private company 3,189us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment  
Changes in assets and liabilities:    
Accounts receivable 9,005us-gaap_IncreaseDecreaseInAccountsReceivable 5,036us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (8,689)us-gaap_IncreaseDecreaseInInventories (2,874)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets 3,895us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,531)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (2,122)us-gaap_IncreaseDecreaseInAccountsPayable (1,287)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities and other liabilities 8,962us-gaap_IncreaseDecreaseInAccruedLiabilities 879us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities 45,795us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 10,585us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchase of severance-related insurance policies (186)mlnx_PurchaseOfSeveranceRelatedInsurancePolicies (205)mlnx_PurchaseOfSeveranceRelatedInsurancePolicies
Purchase of short-term investments (87,793)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (87,500)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sales of short-term investments 37,326us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 48,506us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Proceeds from maturities of short-term investments 17,798us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 14,480us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Decrease in restricted cash deposit   (103)us-gaap_IncreaseDecreaseInRestrictedCash
Purchase of property and equipment (9,521)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (5,818)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of equity investments in private companies   (1,438)us-gaap_PaymentsToAcquireOtherInvestments
Net cash used in investing activities (42,376)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (32,078)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Principal payments on capital lease obligations (281)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (356)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from exercise of share awards 7,192us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 6,699us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Net cash provided by financing activities 6,911us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 6,343us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net decrease in cash and cash equivalents 10,330us-gaap_NetCashProvidedByUsedInContinuingOperations (15,150)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of period 51,326us-gaap_CashAndCashEquivalentsAtCarryingValue 63,164us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 61,656us-gaap_CashAndCashEquivalentsAtCarryingValue $ 48,014us-gaap_CashAndCashEquivalentsAtCarryingValue