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STOCK-BASED COMPENSATION - Expense Related to Employee Stock Options and Nonvested Restricted Common Stock Awards (Details) (USD $)
6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 50,000  
Stock-based compensation $ 2,362,446 $ 2,419,528
Cost of product revenues
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation 472,213 118,692
Research and development
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation 637,528 125,774
Selling, general and administrative
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation $ 1,252,705 $ 2,175,062