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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenue, net $ 70,021us-gaap_SalesRevenueNet $ 66,472us-gaap_SalesRevenueNet
Cost of revenue 22,040us-gaap_CostOfGoodsAndServicesSold 22,915us-gaap_CostOfGoodsAndServicesSold
Gross profit 47,981us-gaap_GrossProfit 43,557us-gaap_GrossProfit
Operating expenses:    
Selling, general and administrative 21,929us-gaap_SellingGeneralAndAdministrativeExpense 24,232us-gaap_SellingGeneralAndAdministrativeExpense
Research and development 31,267us-gaap_ResearchAndDevelopmentExpense 32,590us-gaap_ResearchAndDevelopmentExpense
Change in fair value of contingent consideration 2,100us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 3,140us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Total operating expenses 55,296us-gaap_OperatingExpenses 59,962us-gaap_OperatingExpenses
Loss from operations (7,315)us-gaap_OperatingIncomeLoss (16,405)us-gaap_OperatingIncomeLoss
Other income (expense):    
Foreign exchange (loss) gain (3,697)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 173us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Interest expense (3,437)us-gaap_InterestExpenseDebt (3,196)us-gaap_InterestExpenseDebt
Investment income, net 146us-gaap_InvestmentIncomeNonoperating 207us-gaap_InvestmentIncomeNonoperating
Other, net 0us-gaap_OtherNonoperatingIncomeExpense 0us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes (14,303)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (19,221)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 232us-gaap_IncomeTaxExpenseBenefit 223us-gaap_IncomeTaxExpenseBenefit
Net loss $ (14,535)us-gaap_NetIncomeLoss $ (19,444)us-gaap_NetIncomeLoss
Net loss per common share - basic and diluted $ (0.85)us-gaap_EarningsPerShareBasicAndDiluted $ (1.15)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding - basic and diluted 17,193us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 16,934us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted