Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock-based Compensation Expense Recognized (Detail)

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Stock-based Compensation - Stock-based Compensation Expense Recognized (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total Stock based compensation $ 5,545 $ 7,615
Research and Development Expense [Member]
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total Stock based compensation 10,037 (27,097)
Selling, General and Administrative Expenses [Member]
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total Stock based compensation $ (4,492) $ 34,712