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Stock-Based Compensation - Stock-Based Compensation Expense (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]        
Total stock-based compensation $ 597,005 $ 767,153 $ 2,033,228 $ 2,227,145
Effect on basic and diluted net loss per share $ (0.01) $ (0.03) $ (0.05) $ (0.09)
Research and development expense [Member]
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 346,938 314,393 1,064,301 966,570
Selling, general and administrative expense [Member]
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 250,067 $ 452,760 $ 968,927 $ 1,260,575