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Shared-Based Payments - Schedule of Stock-Based Compensation Expense (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense $ 862,162 $ 838,395 $ 2,347,439
Research and Development [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense 507,142 471,809 1,018,935
General and Administrative [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense $ 355,020 $ 366,586 $ 1,328,504