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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 03, 2015
Apr. 04, 2014
Cash flows from operating activities:    
Net loss $ (2,340)us-gaap_NetIncomeLoss $ (1,359)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 497us-gaap_Depreciation 453us-gaap_Depreciation
Amortization of long-lived intangibles 52us-gaap_AmortizationOfIntangibleAssets 106us-gaap_AmortizationOfIntangibleAssets
Deferred income taxes (118)us-gaap_DeferredIncomeTaxExpenseBenefit 24us-gaap_DeferredIncomeTaxExpenseBenefit
Change in net pension liability 50us-gaap_IncreaseDecreaseInPensionPlanObligations 45us-gaap_IncreaseDecreaseInPensionPlanObligations
Stock-based compensation expense 994us-gaap_ShareBasedCompensation 1,500us-gaap_ShareBasedCompensation
Accretion of asset retirement obligation 1us-gaap_AssetRetirementObligationAccretionExpense 1us-gaap_AssetRetirementObligationAccretionExpense
Provision for sales return and bad debt expense 99us-gaap_ProvisionForDoubtfulAccounts (55)us-gaap_ProvisionForDoubtfulAccounts
Changes in working capital:    
Accounts receivable trade, net (56)us-gaap_IncreaseDecreaseInAccountsReceivable (295)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 617us-gaap_IncreaseDecreaseInInventories (1,137)us-gaap_IncreaseDecreaseInInventories
Prepaids, deposits and other current assets (573)staa_IncreaseDecreaseInPrepaidExpensesDepositsAndOtherAssetsCurrent (1,270)staa_IncreaseDecreaseInPrepaidExpensesDepositsAndOtherAssetsCurrent
Accounts payable (1,741)us-gaap_IncreaseDecreaseInAccountsPayable (610)us-gaap_IncreaseDecreaseInAccountsPayable
Other current liabilities 309us-gaap_IncreaseDecreaseInOtherCurrentLiabilities 3us-gaap_IncreaseDecreaseInOtherCurrentLiabilities
Net cash used in operating activities (2,209)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (2,594)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Acquisition of property and equipment (328)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,414)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Sale of property and equipment 2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (326)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,414)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Repayment of capital lease obligations (115)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (46)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from exercise of stock options 421us-gaap_ProceedsFromStockOptionsExercised 2,188us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 306us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 2,142us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents 25us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (18)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Decrease in cash and cash equivalents (2,204)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,884)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, at beginning of the period 13,013us-gaap_CashAndCashEquivalentsAtCarryingValue 22,954us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, at end of the period $ 10,809us-gaap_CashAndCashEquivalentsAtCarryingValue $ 21,070us-gaap_CashAndCashEquivalentsAtCarryingValue