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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Net revenue $ 178,404us-gaap_SalesRevenueNet $ 119,434us-gaap_SalesRevenueNet $ 126,526us-gaap_SalesRevenueNet
Cost of goods sold 119,587us-gaap_CostOfGoodsAndServicesSold 82,028us-gaap_CostOfGoodsAndServicesSold 81,626us-gaap_CostOfGoodsAndServicesSold
Gross margin 58,817us-gaap_GrossProfit 37,406us-gaap_GrossProfit 44,900us-gaap_GrossProfit
Operating expenses:      
Research, development and engineering 19,426us-gaap_ResearchAndDevelopmentExpense 16,915us-gaap_ResearchAndDevelopmentExpense 22,328us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 28,866us-gaap_SellingGeneralAndAdministrativeExpense 27,842us-gaap_SellingGeneralAndAdministrativeExpense 36,786us-gaap_SellingGeneralAndAdministrativeExpense
Restructuring and other charges 412us-gaap_RestructuringCharges 3,662us-gaap_RestructuringCharges 5,070us-gaap_RestructuringCharges
Total operating expenses 48,704us-gaap_OperatingExpenses 48,419us-gaap_OperatingExpenses 64,184us-gaap_OperatingExpenses
Income (loss) from operations 10,113us-gaap_OperatingIncomeLoss (11,013)us-gaap_OperatingIncomeLoss (19,284)us-gaap_OperatingIncomeLoss
Interest income (expense), net (228)us-gaap_InterestIncomeExpenseNet (494)us-gaap_InterestIncomeExpenseNet 133us-gaap_InterestIncomeExpenseNet
Other income (expense), net 335us-gaap_OtherNonoperatingIncomeExpense (10)us-gaap_OtherNonoperatingIncomeExpense 316us-gaap_OtherNonoperatingIncomeExpense
Income (loss) before income taxes 10,220us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (11,517)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (18,835)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for (benefit from) income taxes 339us-gaap_IncomeTaxExpenseBenefit (542)us-gaap_IncomeTaxExpenseBenefit 484us-gaap_IncomeTaxExpenseBenefit
Net income (loss) $ 9,881us-gaap_NetIncomeLoss $ (10,975)us-gaap_NetIncomeLoss $ (19,319)us-gaap_NetIncomeLoss
Net income (loss) per share:      
Basic (in usd per share) $ 0.14us-gaap_EarningsPerShareBasic $ (0.19)us-gaap_EarningsPerShareBasic $ (0.33)us-gaap_EarningsPerShareBasic
Diluted (in usd per share) $ 0.13us-gaap_EarningsPerShareDiluted $ (0.19)us-gaap_EarningsPerShareDiluted $ (0.33)us-gaap_EarningsPerShareDiluted
Shares used in computing net income (loss) per share:      
Basic (in shares) 71,897,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 58,944,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 58,538,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 73,403,000.00us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 58,944,000.00us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 58,538,000.00us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding