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Share-Based Compensation Expense - Estimated Share-Based Compensation Expense Related to Equity Awards Granted to Employees and Non-Employee Directors (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense $ 442,328 $ 359,543 $ 1,159,021 $ 1,073,872
Selling, General and Administrative Expense [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense 395,316 338,447 1,033,921 1,036,373
Research and Development Expense [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense $ 47,012 $ 21,096 $ 125,100 $ 37,499