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Statements of Operations and Comprehensive Loss (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenue $ 0us-gaap_Revenues $ 0us-gaap_Revenues
Costs and expenses:    
Research and development expense 5,207,730us-gaap_ResearchAndDevelopmentExpense 3,881,720us-gaap_ResearchAndDevelopmentExpense
General and administrative expense 1,904,963us-gaap_GeneralAndAdministrativeExpense 1,224,903us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses 7,112,693us-gaap_OperatingCostsAndExpenses 5,106,623us-gaap_OperatingCostsAndExpenses
Loss from operations (7,112,693)us-gaap_OperatingIncomeLoss (5,106,623)us-gaap_OperatingIncomeLoss
Other income 3,564us-gaap_OtherNonoperatingIncomeExpense 4,773us-gaap_OtherNonoperatingIncomeExpense
Net loss and comprehensive loss $ (7,109,129)us-gaap_NetIncomeLoss $ (5,101,850)us-gaap_NetIncomeLoss
Basic and diluted net loss per common share $ (0.37)us-gaap_EarningsPerShareBasicAndDiluted $ (0.30)us-gaap_EarningsPerShareBasicAndDiluted
Basic and diluted weighted average number of common shares 18,961,531us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 17,232,566us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted