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Condensed 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
Income Statement [Abstract]    
Collaboration revenue $ 244us-gaap_Revenues $ 568us-gaap_Revenues
Operating expenses:    
Research and development 5,238us-gaap_ResearchAndDevelopmentExpense 5,819us-gaap_ResearchAndDevelopmentExpense
General and administrative 2,603us-gaap_GeneralAndAdministrativeExpense 1,938us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 7,841us-gaap_OperatingExpenses 7,757us-gaap_OperatingExpenses
Loss from operations (7,597)us-gaap_OperatingIncomeLoss (7,189)us-gaap_OperatingIncomeLoss
Other income (expense):    
Other income, net 1,308us-gaap_OtherNonoperatingIncomeExpense 51us-gaap_OtherNonoperatingIncomeExpense
Interest expense (235)us-gaap_InterestIncomeExpenseNonoperatingNet (84)us-gaap_InterestIncomeExpenseNonoperatingNet
Total other income (expense), net 1,073us-gaap_NonoperatingIncomeExpense (33)us-gaap_NonoperatingIncomeExpense
Net loss and comprehensive loss (6,524)us-gaap_NetIncomeLoss (7,222)us-gaap_NetIncomeLoss
Cumulative preferred stock dividends   (519)us-gaap_PreferredStockDividendsAndOtherAdjustments
Net loss applicable to common stockholders $ (6,524)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (7,741)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net loss per share applicable to common stockholders-basic and diluted $ (0.36)us-gaap_EarningsPerShareBasicAndDiluted $ (0.80)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average number of common shares used in net loss per share applicable to common stockholders-basic and diluted 17,971us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 9,635us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted