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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Costs and expenses: |  |
Research and development | $ 5,625 us-gaap_ResearchAndDevelopmentExpense | $ 2,928 us-gaap_ResearchAndDevelopmentExpense
General and administrative | 4,068 us-gaap_GeneralAndAdministrativeExpense | 4,012 us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses | 9,693 us-gaap_CostsAndExpenses | 6,940 us-gaap_CostsAndExpenses
Loss from operations | (9,693)us-gaap_OperatingIncomeLoss | (6,940)us-gaap_OperatingIncomeLoss
Interest and other income | 7 us-gaap_InterestAndOtherIncome | 5 us-gaap_InterestAndOtherIncome
Interest expense | (3)us-gaap_InterestExpense | (4)us-gaap_InterestExpense
Net loss and comprehensive loss | (9,689)us-gaap_NetIncomeLoss | (6,939)us-gaap_NetIncomeLoss
Less: Deemed preferred stock dividend |  | (2,026)us-gaap_PreferredStockDividendsAndOtherAdjustments
Net loss available to common stockholders | $ (9,689)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (8,965)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net loss available to common stockholders per share: |  |
Basic and diluted | $ (0.47)us-gaap_EarningsPerShareBasicAndDiluted | $ (1.04)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding: |  |
Basic and diluted | 20,501,224 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 8,629,479 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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