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Condensed Consolidated Statements of Operations (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenues $ 3,315us-gaap_Revenues $ 167,787us-gaap_Revenues
Costs and expenses:    
Research and development 18,632,427us-gaap_ResearchAndDevelopmentExpense 2,829,299us-gaap_ResearchAndDevelopmentExpense
General and administrative 3,771,628us-gaap_GeneralAndAdministrativeExpense 1,912,951us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses 22,404,055us-gaap_OperatingCostsAndExpenses 4,742,250us-gaap_OperatingCostsAndExpenses
Loss from operations (22,400,740)us-gaap_OperatingIncomeLoss (4,574,463)us-gaap_OperatingIncomeLoss
Interest income 113,916us-gaap_InvestmentIncomeInterest 36,220us-gaap_InvestmentIncomeInterest
Interest expense   (5,041)us-gaap_InterestExpense
Net loss $ (22,286,824)us-gaap_NetIncomeLoss $ (4,543,284)us-gaap_NetIncomeLoss
Net loss per common share:    
Basic & Diluted $ (0.72)us-gaap_EarningsPerShareBasicAndDiluted $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of common shares:    
Basic & Diluted 30,775,287us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 26,475,907us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted