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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Mar. 29, 2014
Income Statement [Abstract]        
Revenues $ 14,114us-gaap_SalesRevenueNet $ 15,121us-gaap_SalesRevenueNet $ 40,313us-gaap_SalesRevenueNet $ 43,280us-gaap_SalesRevenueNet
Cost of revenues 8,277us-gaap_CostOfGoodsSold 8,207us-gaap_CostOfGoodsSold 22,973us-gaap_CostOfGoodsSold 23,265us-gaap_CostOfGoodsSold
Gross margin 5,837us-gaap_GrossProfit 6,914us-gaap_GrossProfit 17,340us-gaap_GrossProfit 20,015us-gaap_GrossProfit
Operating expenses:        
Research, development and engineering 2,041us-gaap_ResearchAndDevelopmentExpense 1,774us-gaap_ResearchAndDevelopmentExpense 5,413us-gaap_ResearchAndDevelopmentExpense 5,180us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 4,827us-gaap_SellingGeneralAndAdministrativeExpense 4,813us-gaap_SellingGeneralAndAdministrativeExpense 14,765us-gaap_SellingGeneralAndAdministrativeExpense 14,479us-gaap_SellingGeneralAndAdministrativeExpense
Settlement of litigation     260us-gaap_LitigationSettlementExpense  
Amortization of other intangible assets 61us-gaap_AmortizationOfIntangibleAssets 61us-gaap_AmortizationOfIntangibleAssets 183us-gaap_AmortizationOfIntangibleAssets 183us-gaap_AmortizationOfIntangibleAssets
Total operating expenses 6,929us-gaap_OperatingExpenses 6,648us-gaap_OperatingExpenses 20,621us-gaap_OperatingExpenses 19,842us-gaap_OperatingExpenses
Operating income (loss) (1,092)us-gaap_OperatingIncomeLoss 266us-gaap_OperatingIncomeLoss (3,281)us-gaap_OperatingIncomeLoss 173us-gaap_OperatingIncomeLoss
Interest income (expense), net (11)us-gaap_InterestIncomeExpenseNonoperatingNet 12us-gaap_InterestIncomeExpenseNonoperatingNet (11)us-gaap_InterestIncomeExpenseNonoperatingNet 7us-gaap_InterestIncomeExpenseNonoperatingNet
Foreign currency exchange gain (loss) (291)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 140us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (387)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 201us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Income (loss) before income taxes (1,394)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 418us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (3,679)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 381us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for (benefit from) income taxes (70)us-gaap_IncomeTaxExpenseBenefit 153us-gaap_IncomeTaxExpenseBenefit (80)us-gaap_IncomeTaxExpenseBenefit 310us-gaap_IncomeTaxExpenseBenefit
Net income (loss) (1,324)us-gaap_NetIncomeLoss 265us-gaap_NetIncomeLoss (3,599)us-gaap_NetIncomeLoss 71us-gaap_NetIncomeLoss
Effects of redeemable convertible preferred stock:        
Accretion of preferred stock to redemption value   (234)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment   (282)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Dividends allocated to preferred stockholders   (43)us-gaap_TemporaryEquityDividendsAdjustment   (203)us-gaap_TemporaryEquityDividendsAdjustment
Net loss attributable to common stockholders (1,324)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (12)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (3,599)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (414)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net loss per share attributable to common stockholders:        
Basic $ (0.10)us-gaap_EarningsPerShareBasic $ 0.00us-gaap_EarningsPerShareBasic $ (0.28)us-gaap_EarningsPerShareBasic $ (0.04)us-gaap_EarningsPerShareBasic
Diluted $ (0.10)us-gaap_EarningsPerShareDiluted $ 0.00us-gaap_EarningsPerShareDiluted $ (0.28)us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted
Number of shares used in computing net loss per share attributable to common stockholders        
Basic 13,113us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,955us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 13,087us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,278us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 13,113us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,955us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 13,087us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,278us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Comprehensive income (loss):        
Net income (loss) (1,324)us-gaap_NetIncomeLoss 265us-gaap_NetIncomeLoss (3,599)us-gaap_NetIncomeLoss 71us-gaap_NetIncomeLoss
Foreign currency translation adjustment (263)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (139)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (500)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 119us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Total comprehensive income (loss) $ (1,587)us-gaap_ComprehensiveIncomeNetOfTax $ 126us-gaap_ComprehensiveIncomeNetOfTax $ (4,099)us-gaap_ComprehensiveIncomeNetOfTax $ 190us-gaap_ComprehensiveIncomeNetOfTax