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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]      
Revenue $ 45,685us-gaap_SalesRevenueGoodsNet $ 41,513us-gaap_SalesRevenueGoodsNet $ 67,243us-gaap_SalesRevenueGoodsNet
Cost of goods sold 75,372us-gaap_CostOfGoodsSold 63,434us-gaap_CostOfGoodsSold 67,283us-gaap_CostOfGoodsSold
Gross loss (29,687)us-gaap_GrossProfit (21,921)us-gaap_GrossProfit (40)us-gaap_GrossProfit
Operating expenses:      
General and administrative 9,863us-gaap_GeneralAndAdministrativeExpense 8,629us-gaap_GeneralAndAdministrativeExpense 9,018us-gaap_GeneralAndAdministrativeExpense
Sales and marketing 1,468us-gaap_SellingAndMarketingExpense 1,521us-gaap_SellingAndMarketingExpense 1,685us-gaap_SellingAndMarketingExpense
Research and development 1,861us-gaap_ResearchAndDevelopmentExpense 2,263us-gaap_ResearchAndDevelopmentExpense 2,274us-gaap_ResearchAndDevelopmentExpense
Loss on disposal of assets 734us-gaap_GainLossOnDispositionOfAssets 550us-gaap_GainLossOnDispositionOfAssets 19us-gaap_GainLossOnDispositionOfAssets
Loss from operations (43,613)us-gaap_OperatingIncomeLoss (34,884)us-gaap_OperatingIncomeLoss (13,036)us-gaap_OperatingIncomeLoss
Other income (expense):      
Interest income 86us-gaap_InvestmentIncomeInterest 51us-gaap_InvestmentIncomeInterest 93us-gaap_InvestmentIncomeInterest
Interest expense (95)us-gaap_InterestExpense (95)us-gaap_InterestExpense  
Realized (loss) gain on foreign currency translation (551)us-gaap_ForeignCurrencyTransactionGainLossRealized (583)us-gaap_ForeignCurrencyTransactionGainLossRealized 349us-gaap_ForeignCurrencyTransactionGainLossRealized
Realized gain on investments 258us-gaap_GainLossOnInvestments   8us-gaap_GainLossOnInvestments
Total other (expense) income (302)us-gaap_NonoperatingIncomeExpense (627)us-gaap_NonoperatingIncomeExpense 450us-gaap_NonoperatingIncomeExpense
Loss before income taxes (43,915)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (35,511)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (12,586)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (expense) benefit (78)us-gaap_IncomeTaxExpenseBenefit 5,160us-gaap_IncomeTaxExpenseBenefit 7,048us-gaap_IncomeTaxExpenseBenefit
Net loss $ (43,993)us-gaap_NetIncomeLoss $ (30,351)us-gaap_NetIncomeLoss $ (5,538)us-gaap_NetIncomeLoss
Net loss per common share      
Basic $ (1.70)us-gaap_EarningsPerShareBasic $ (1.35)us-gaap_EarningsPerShareBasic $ (0.25)us-gaap_EarningsPerShareBasic
Diluted $ (1.70)us-gaap_EarningsPerShareDiluted $ (1.35)us-gaap_EarningsPerShareDiluted $ (0.25)us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding used in computing net loss per common share      
Basic 25,815,405us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,572,212us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,523,951us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 25,815,405us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 22,572,212us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 22,523,951us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding