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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 02, 2015
Jan. 03, 2014
Dec. 28, 2012
Cash flows from operating activities:      
Net income (loss) $ (8,392)us-gaap_NetIncomeLoss $ 398us-gaap_NetIncomeLoss $ (1,763)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation of property and equipment 2,078us-gaap_Depreciation 1,711us-gaap_Depreciation 1,309us-gaap_Depreciation
Amortization of intangibles 382us-gaap_AmortizationOfIntangibleAssets 440us-gaap_AmortizationOfIntangibleAssets 652us-gaap_AmortizationOfIntangibleAssets
Deferred income taxes (841)us-gaap_DeferredIncomeTaxExpenseBenefit 104us-gaap_DeferredIncomeTaxExpenseBenefit 143us-gaap_DeferredIncomeTaxExpenseBenefit
Fair value adjustment of warrant 0us-gaap_FairValueAdjustmentOfWarrants (27)us-gaap_FairValueAdjustmentOfWarrants (335)us-gaap_FairValueAdjustmentOfWarrants
Change in net pension liability 194us-gaap_IncreaseDecreaseInPensionPlanObligations 162us-gaap_IncreaseDecreaseInPensionPlanObligations 205us-gaap_IncreaseDecreaseInPensionPlanObligations
Loss on disposal of property and equipment 0us-gaap_GainLossOnDispositionOfAssets 200us-gaap_GainLossOnDispositionOfAssets 131us-gaap_GainLossOnDispositionOfAssets
Stock-based compensation expense 4,663us-gaap_ShareBasedCompensation 4,489us-gaap_ShareBasedCompensation 3,208us-gaap_ShareBasedCompensation
Accretion of asset retirement obligation 3us-gaap_AssetRetirementObligationAccretionExpense 10us-gaap_AssetRetirementObligationAccretionExpense 16us-gaap_AssetRetirementObligationAccretionExpense
Provision for sales returns and bad debts 182us-gaap_ProvisionForDoubtfulAccounts 263us-gaap_ProvisionForDoubtfulAccounts 77us-gaap_ProvisionForDoubtfulAccounts
Changes in working capital:      
Accounts receivable trade, net (934)us-gaap_IncreaseDecreaseInAccountsReceivable (2,938)us-gaap_IncreaseDecreaseInAccountsReceivable 224us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net (3,943)us-gaap_IncreaseDecreaseInInventories (1,603)us-gaap_IncreaseDecreaseInInventories (1,020)us-gaap_IncreaseDecreaseInInventories
Prepaids, deposits and other current assets (1,062)staa_IncreaseDecreaseInPrepaidExpensesDepositsAndOtherAssetsCurrent (1,063)staa_IncreaseDecreaseInPrepaidExpensesDepositsAndOtherAssetsCurrent (298)staa_IncreaseDecreaseInPrepaidExpensesDepositsAndOtherAssetsCurrent
Accounts payable 972us-gaap_IncreaseDecreaseInAccountsPayable 367us-gaap_IncreaseDecreaseInAccountsPayable 1,014us-gaap_IncreaseDecreaseInAccountsPayable
Other current liabilities (1,253)us-gaap_IncreaseDecreaseInOtherCurrentLiabilities 842us-gaap_IncreaseDecreaseInOtherCurrentLiabilities (346)us-gaap_IncreaseDecreaseInOtherCurrentLiabilities
Net cash provided by (used in) by operating activities (7,951)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 3,355us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 3,217us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Acquisition of property and equipment (4,054)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,448)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,271)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net change in other noncurrent assets 0us-gaap_PaymentsToAcquireOtherProductiveAssets 0us-gaap_PaymentsToAcquireOtherProductiveAssets (4)us-gaap_PaymentsToAcquireOtherProductiveAssets
Decrease in restricted cash, including reinvested interest 0us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments 0us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments 129us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments
Net cash used in investing activities (4,054)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (3,448)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (2,146)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Borrowings under lines of credit 0us-gaap_ProceedsFromLinesOfCredit 0us-gaap_ProceedsFromLinesOfCredit 3,510us-gaap_ProceedsFromLinesOfCredit
Repayment of capital lease lines of credit (490)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (841)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (741)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from the exercise of stock options 3,022us-gaap_ProceedsFromStockOptionsExercised 3,286us-gaap_ProceedsFromStockOptionsExercised 1,514us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 2,532us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 2,445us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 4,283us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents (468)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (1,073)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (261)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase (decrease) in cash and cash equivalents (9,941)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,279us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 5,093us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, at beginning of year 22,954us-gaap_CashAndCashEquivalentsAtCarryingValue 21,675us-gaap_CashAndCashEquivalentsAtCarryingValue 16,582us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, at end of year $ 13,013us-gaap_CashAndCashEquivalentsAtCarryingValue $ 22,954us-gaap_CashAndCashEquivalentsAtCarryingValue $ 21,675us-gaap_CashAndCashEquivalentsAtCarryingValue