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Significant Accounting Policies - Computation of Basic and Diluted Net Loss per Common Share (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net loss $ (7,109,129)us-gaap_NetIncomeLoss $ (5,101,850)us-gaap_NetIncomeLoss
Basic and diluted net loss $ (0.37)us-gaap_EarningsPerShareBasicAndDiluted $ (0.30)us-gaap_EarningsPerShareBasicAndDiluted
Basic and diluted weighted average common shares outstanding 18,961,531us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 17,232,566us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted