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STOCK-BASED COMPENSATION - Expense Related to Employee Stock Options and Nonvested Restricted Common Stock Awards (Details) - USD ($)
9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation $ 2,786,494 $ 3,555,454
Cost of product revenues    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation 620,494 590,467
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation 669,605 773,106
Selling, general and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation $ 1,496,395 $ 2,191,881