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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) $ 9,502us-gaap_NetIncomeLoss $ 7,804us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 3,766us-gaap_ShareBasedCompensation 2,899us-gaap_ShareBasedCompensation
Depreciation 3,227us-gaap_Depreciation 3,481us-gaap_Depreciation
Amortization of intangible assets 6,322us-gaap_AmortizationOfIntangibleAssets 6,797us-gaap_AmortizationOfIntangibleAssets
Non-cash interest expense and amortization of convertible debt issuance costs 1,559us-gaap_AmortizationOfFinancingCostsAndDiscounts 6,242us-gaap_AmortizationOfFinancingCostsAndDiscounts
Deferred income taxes 644us-gaap_DeferredIncomeTaxExpenseBenefit 5,967us-gaap_DeferredIncomeTaxExpenseBenefit
Gain from sale of intellectual property (2,267)us-gaap_GainLossOnDispositionOfAssets1 (170)us-gaap_GainLossOnDispositionOfAssets1
Change in operating assets and liabilities:    
Accounts receivable (540)us-gaap_IncreaseDecreaseInAccountsReceivable (5,565)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other assets (1,436)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (183)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (965)us-gaap_IncreaseDecreaseInAccountsPayable 749us-gaap_IncreaseDecreaseInAccountsPayable
Accrued salaries and benefits and other liabilities (5,959)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (6,623)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Income taxes payable (86)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (4,828)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Deferred revenue 1,272us-gaap_IncreaseDecreaseInDeferredRevenue (59)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by operating activities 15,039us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 16,511us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,095)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,145)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of marketable securities (46,779)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (34,050)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Maturities of marketable securities 40,070us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 26,050us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from sale of marketable securities 6,600us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 0us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Proceeds from sale of intellectual property 2,280us-gaap_ProceedsFromSaleOfIntangibleAssets 1,250us-gaap_ProceedsFromSaleOfIntangibleAssets
Net cash provided by (used in) investing activities 1,076us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (9,895)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 1,424us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,352us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Principal payments against lease financing obligation (98)rmbs_PrincipalPaymentsAgainstLeaseFinancingObligation (60)rmbs_PrincipalPaymentsAgainstLeaseFinancingObligation
Payments under installment payment arrangement 0rmbs_PaymentsUnderInstallment (28)rmbs_PaymentsUnderInstallment
Net cash provided by financing activities 1,326us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 1,264us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 17,441us-gaap_NetCashProvidedByUsedInContinuingOperations 7,880us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of period 154,126us-gaap_CashAndCashEquivalentsAtCarryingValue 338,696us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 171,567us-gaap_CashAndCashEquivalentsAtCarryingValue 346,576us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-cash investing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 248us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 $ 280us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1