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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating expenses    
Research and development $ 17,100us-gaap_ResearchAndDevelopmentExpense $ 4,869us-gaap_ResearchAndDevelopmentExpense
General and administrative 5,181us-gaap_GeneralAndAdministrativeExpense 2,714us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 22,281us-gaap_OperatingExpenses 7,583us-gaap_OperatingExpenses
Loss from operations (22,281)us-gaap_OperatingIncomeLoss (7,583)us-gaap_OperatingIncomeLoss
Interest income 49us-gaap_InvestmentIncomeInterest  
Other income (expense), net 226us-gaap_OtherNonoperatingIncomeExpense (11,843)us-gaap_OtherNonoperatingIncomeExpense
Net loss and comprehensive loss (22,006)us-gaap_NetIncomeLoss (19,426)us-gaap_NetIncomeLoss
Deemed dividend related to beneficial conversion feature of convertible preferred stock   (25,559)us-gaap_OtherPreferredStockDividendsAndAdjustments
Net loss attributable to common stockholders $ (22,006)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (44,985)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net loss per basic and diluted share attributable to common stockholders $ (0.79)us-gaap_EarningsPerShareBasicAndDiluted $ (16.13)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average common shares used to compute basic and diluted net loss per share 27,810us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 2,788us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted