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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Adjustments to reconcile net loss to net cash used for operating activities:    
Net loss $ (36,913)us-gaap_NetIncomeLoss $ (28,810)us-gaap_NetIncomeLoss
Depreciation 6,624us-gaap_Depreciation 7,728us-gaap_Depreciation
Amortization of purchased intangible assets 105us-gaap_AmortizationOfIntangibleAssets 420us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation expense 14,303us-gaap_ShareBasedCompensation 13,430us-gaap_ShareBasedCompensation
Veloce acquisition consideration 7,140us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable 42,684us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Gain on sale of TPack 0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal (19,699)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Loss on disposals of property and equipment 22us-gaap_GainLossOnDispositionOfAssets 27us-gaap_GainLossOnDispositionOfAssets
Impairment of a strategic investment 2,500us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Non-cash restructuring charges 14us-gaap_RestructuringCosts 298us-gaap_RestructuringCosts
Tax effect on other comprehensive loss (34)us-gaap_OtherComprehensiveIncomeLossTax 0us-gaap_OtherComprehensiveIncomeLossTax
Changes in operating assets and liabilities:    
Accounts receivable, net 5,931us-gaap_IncreaseDecreaseInAccountsReceivable (4,459)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (5,271)us-gaap_IncreaseDecreaseInInventories 2,415us-gaap_IncreaseDecreaseInInventories
Assets held for sale 0us-gaap_IncreaseDecreaseInAssetsHeldForSale (14,260)us-gaap_IncreaseDecreaseInAssetsHeldForSale
Other assets 484us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (16,475)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (3,629)us-gaap_IncreaseDecreaseInAccountsPayable (4,423)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued payroll and other accrued liabilities (927)us-gaap_IncreaseDecreaseInAccruedSalaries 610us-gaap_IncreaseDecreaseInAccruedSalaries
Veloce accrued liability (8,981)amcc_IncreaseDecreaseinAccruedAcquisitionLiability (45,432)amcc_IncreaseDecreaseinAccruedAcquisitionLiability
Deferred revenue (188)us-gaap_IncreaseDecreaseInDeferredRevenue (449)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used for operating activities (19,788)us-gaap_NetCashProvidedByUsedInOperatingActivities (33,445)us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:    
Proceeds from sales and maturities of short-term investments 5,075us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 26,594us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Purchases of short-term investments (2,722)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (16,241)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sale of property and equipment 1us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 20us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchase of property and equipment (7,571)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (5,616)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of strategic equity investment 0us-gaap_ProceedsFromSaleOfEquityMethodInvestments 1,286us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Proceeds from sale of TPack, net (3,353)us-gaap_ProceedsFromSaleOfProductiveAssets (29,498)us-gaap_ProceedsFromSaleOfProductiveAssets
Net cash (used for) provided by investing activities (1,864)us-gaap_NetCashProvidedByUsedInInvestingActivities 35,541us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:    
Proceeds from issuance of common stock 1,890us-gaap_ProceedsFromIssuanceOfCommonStock 8,582us-gaap_ProceedsFromIssuanceOfCommonStock
Funding of restricted stock units withheld for taxes (1,609)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (5,518)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Other (88)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (595)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by financing activities 193us-gaap_NetCashProvidedByUsedInFinancingActivities 2,469us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents (21,459)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 4,565us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 71,539us-gaap_CashAndCashEquivalentsAtCarryingValue 19,065us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 50,080us-gaap_CashAndCashEquivalentsAtCarryingValue 23,630us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplementary cash flow disclosures:    
Cash paid for income taxes 643us-gaap_IncomeTaxesPaidNet 609us-gaap_IncomeTaxesPaidNet
Common stock issued for Veloce merger consideration $ 872us-gaap_StockIssued1 $ 29,209us-gaap_StockIssued1