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STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Expenses:    
Research and development $ 5,468us-gaap_ResearchAndDevelopmentExpense $ 2,149us-gaap_ResearchAndDevelopmentExpense
General and administrative 1,447us-gaap_GeneralAndAdministrativeExpense 516us-gaap_GeneralAndAdministrativeExpense
Loss from operations (6,915)us-gaap_OperatingIncomeLoss (2,665)us-gaap_OperatingIncomeLoss
Change in fair value of warrant liability   428us-gaap_FairValueAdjustmentOfWarrants
Interest income 14us-gaap_InterestIncomeOther 4us-gaap_InterestIncomeOther
Interest expense (116)us-gaap_InterestExpense  
Other income (expense) 10us-gaap_OtherOperatingIncomeExpenseNet (2)us-gaap_OtherOperatingIncomeExpenseNet
Net loss (7,007)us-gaap_NetIncomeLoss (2,235)us-gaap_NetIncomeLoss
Cumulative preferred stock dividends   (1,071)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net loss applicable to common stockholders $ (7,007)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (3,306)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Per share information:    
Net loss per share of common stock-basic and diluted (in dollars per share) $ (0.50)us-gaap_EarningsPerShareBasicAndDiluted $ (7.09)us-gaap_EarningsPerShareBasicAndDiluted
Basic and diluted weighted average shares outstanding (in shares) 14,068,238us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 466,531us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted