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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]    
Revenues $ 20,453us-gaap_SalesRevenueNet $ 12,134us-gaap_SalesRevenueNet
Cost of sales 3,722us-gaap_CostOfGoodsSold 1,314us-gaap_CostOfGoodsSold
Gross profit 16,731us-gaap_GrossProfit 10,820us-gaap_GrossProfit
Operating expenses:    
Research and development 16,552us-gaap_ResearchAndDevelopmentExpense 9,547us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 14,839us-gaap_GeneralAndAdministrativeExpense 12,064us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 31,391us-gaap_OperatingExpenses 21,611us-gaap_OperatingExpenses
Loss from operations (14,660)us-gaap_OperatingIncomeLoss (10,791)us-gaap_OperatingIncomeLoss
Interest income 27us-gaap_InvestmentIncomeInterest 31us-gaap_InvestmentIncomeInterest
Interest expense (4,498)us-gaap_InterestExpense (2,979)us-gaap_InterestExpense
Foreign currency transaction gain (476)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 17us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
(Loss) gain on short-term investments 0us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments 0us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Adjustment to fair value of common stock warrants (55)us-gaap_FairValueAdjustmentOfWarrants (1,163)us-gaap_FairValueAdjustmentOfWarrants
Other income 0us-gaap_OtherNonoperatingIncome 0us-gaap_OtherNonoperatingIncome
Net loss before provision for income taxes (19,662)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (14,885)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes (21)us-gaap_IncomeTaxExpenseBenefit (6)us-gaap_IncomeTaxExpenseBenefit
Net Loss (19,683)us-gaap_NetIncomeLoss (14,891)us-gaap_NetIncomeLoss
Other comprehensive income (loss):    
Foreign currency translation gain (loss) (547)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 150us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive Loss $ (20,230)us-gaap_ComprehensiveIncomeNetOfTax $ (14,741)us-gaap_ComprehensiveIncomeNetOfTax
Net loss per share:    
Basic and diluted (in dollars per share) $ (0.28)us-gaap_EarningsPerShareBasicAndDiluted $ (0.24)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average shares outstanding:    
Basic and diluted (in shares) 69,140,642us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 62,118,796us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted