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Stock-Based Compensation Expense (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense $ 312,691 $ 214,797 $ 562,762 $ 455,669
Cost of product revenue
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense 11,428 13,368 23,093 22,774
Research and development
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense 36,081 64,489 43,721 116,825
Selling, general and administrative
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense $ 265,182 $ 136,940 $ 495,948 $ 316,070