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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Collaboration revenue - related party $ 34,202us-gaap_RevenueFromRelatedParties $ 8,411us-gaap_RevenueFromRelatedParties
Operating expenses:    
Research and development (net of $4,366 of cost reimbursement from related party for the three months ended March 31, 2015) 32,443us-gaap_ResearchAndDevelopmentExpense 17,407us-gaap_ResearchAndDevelopmentExpense
General and administrative 6,954us-gaap_GeneralAndAdministrativeExpense 3,288us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 39,397us-gaap_OperatingExpenses 20,695us-gaap_OperatingExpenses
Loss from operations (5,195)us-gaap_OperatingIncomeLoss (12,284)us-gaap_OperatingIncomeLoss
Interest income 238us-gaap_InvestmentIncomeInterest 36us-gaap_InvestmentIncomeInterest
Net loss $ (4,957)us-gaap_NetIncomeLoss $ (12,248)us-gaap_NetIncomeLoss
Net loss per share - basic and diluted $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted $ (0.39)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average number of common shares used in net loss per share - basic and diluted 37,214,747us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 31,394,563us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted