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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Product revenues, net $ 54,202us-gaap_Revenues $ 26,351us-gaap_Revenues  
Less: Cost of goods sold 20,485us-gaap_CostOfGoodsSold 11,912us-gaap_CostOfGoodsSold  
Gross margin 33,717us-gaap_GrossProfit 14,439us-gaap_GrossProfit  
Operating expenses:      
Selling, general and administrative 79,346us-gaap_SellingGeneralAndAdministrativeExpense 123,795us-gaap_SellingGeneralAndAdministrativeExpense 57,794us-gaap_SellingGeneralAndAdministrativeExpense
Research and development 50,326us-gaap_ResearchAndDevelopmentExpense 72,750us-gaap_ResearchAndDevelopmentExpense 58,956us-gaap_ResearchAndDevelopmentExpense
Total operating expenses 129,672us-gaap_OperatingExpenses 196,545us-gaap_OperatingExpenses 116,750us-gaap_OperatingExpenses
Operating loss (95,955)us-gaap_OperatingIncomeLoss (182,106)us-gaap_OperatingIncomeLoss (116,750)us-gaap_OperatingIncomeLoss
Gain (loss) on change in fair value of derivative liabilities 13,472us-gaap_UnrealizedGainLossOnDerivatives 47,710us-gaap_UnrealizedGainLossOnDerivatives (35,344)us-gaap_UnrealizedGainLossOnDerivatives
Gain on extinguishment of debt 38,034us-gaap_GainsLossesOnExtinguishmentOfDebt    
Interest expense (18,575)us-gaap_InterestExpense (34,179)us-gaap_InterestExpense (18,091)us-gaap_InterestExpense
Interest income 96us-gaap_InvestmentIncomeInterest 343us-gaap_InvestmentIncomeInterest 544us-gaap_InvestmentIncomeInterest
Other income (expense), net 3,727us-gaap_OtherNonoperatingIncomeExpense (1,189)us-gaap_OtherNonoperatingIncomeExpense (427)us-gaap_OtherNonoperatingIncomeExpense
Loss from operations before taxes (59,201)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (169,421)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (170,068)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from (provision for) income taxes 2,837us-gaap_IncomeTaxExpenseBenefit 3,194us-gaap_IncomeTaxExpenseBenefit (9,116)us-gaap_IncomeTaxExpenseBenefit
Net loss $ (56,364)us-gaap_NetIncomeLoss $ (166,227)us-gaap_NetIncomeLoss $ (179,184)us-gaap_NetIncomeLoss
Loss per share:      
Basic $ (0.32)us-gaap_EarningsPerShareBasic $ (1.03)us-gaap_EarningsPerShareBasic $ (1.24)us-gaap_EarningsPerShareBasic
Diluted $ (0.36)us-gaap_EarningsPerShareDiluted $ (1.28)us-gaap_EarningsPerShareDiluted $ (1.24)us-gaap_EarningsPerShareDiluted
Weighted average shares:      
Basic 173,719us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 161,022us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 144,017us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 173,824us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 167,070us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 144,017us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding