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Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating expenses:    
Research and development $ 17,164us-gaap_ResearchAndDevelopmentExpense $ 11,351us-gaap_ResearchAndDevelopmentExpense
General and administrative 9,542us-gaap_GeneralAndAdministrativeExpense 6,728us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 26,706us-gaap_OperatingExpenses 18,079us-gaap_OperatingExpenses
Operating loss (26,706)us-gaap_OperatingIncomeLoss (18,079)us-gaap_OperatingIncomeLoss
Investment income 23us-gaap_InvestmentIncomeNonoperating 17us-gaap_InvestmentIncomeNonoperating
Interest expense (722)us-gaap_InterestExpense (606)us-gaap_InterestExpense
Other income (expense), net 36us-gaap_OtherNonoperatingIncomeExpense (19)us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes (27,369)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (18,687)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from income taxes   (4,389)us-gaap_IncomeTaxExpenseBenefit
Net loss and comprehensive loss $ (27,369)us-gaap_NetIncomeLoss $ (14,298)us-gaap_NetIncomeLoss
Basic and diluted net loss per share (in dollars per share) $ (0.55)us-gaap_EarningsPerShareBasicAndDiluted $ (0.36)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average basic and diluted common shares outstanding (in shares) 49,957us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 39,240us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted