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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue $ 7,692us-gaap_SalesRevenueGoodsNet $ 7,866us-gaap_SalesRevenueGoodsNet
Cost of revenue 4,714us-gaap_CostOfGoodsSold 4,157us-gaap_CostOfGoodsSold
Gross profit on revenue 2,978us-gaap_GrossProfit 3,709us-gaap_GrossProfit
Operating expenses:    
Research and development 5,581us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost 4,642us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Selling, general and administrative 11,718us-gaap_SellingGeneralAndAdministrativeExpense 8,236us-gaap_SellingGeneralAndAdministrativeExpense
Amortization of intangible assets 50us-gaap_AmortizationOfIntangibleAssets 50us-gaap_AmortizationOfIntangibleAssets
Total operating expenses 17,349us-gaap_OperatingExpenses 12,928us-gaap_OperatingExpenses
Loss from operations (14,371)us-gaap_OperatingIncomeLoss (9,219)us-gaap_OperatingIncomeLoss
Non-operating income (expense), net:    
Gain from revaluation of warrant liability 6,296us-gaap_FairValueAdjustmentOfWarrants 9,034us-gaap_FairValueAdjustmentOfWarrants
Foreign exchange (loss) gain (1,113)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 21us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Interest expense (255)us-gaap_InterestExpense (50)us-gaap_InterestExpense
Other income, net 2us-gaap_OtherNonoperatingIncomeExpense 27us-gaap_OtherNonoperatingIncomeExpense
Total non-operating income (expense), net 4,930us-gaap_NonoperatingIncomeExpense 9,032us-gaap_NonoperatingIncomeExpense
Loss before income taxes (9,441)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (187)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 19us-gaap_IncomeTaxExpenseBenefit 38us-gaap_IncomeTaxExpenseBenefit
Net loss $ (9,460)us-gaap_NetIncomeLoss $ (225)us-gaap_NetIncomeLoss
Net loss per share:    
Basic $ (0.10)us-gaap_EarningsPerShareBasic $ 0.00us-gaap_EarningsPerShareBasic
Diluted $ (0.17)us-gaap_EarningsPerShareDiluted $ (0.12)us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding used in the calculation of net loss per share:    
Basic 93,411us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 72,088us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 94,662us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 75,158us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding