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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. 24, 2016
Sep. 26, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense $ 1,479,481 $ 2,786,494
Cost of product revenues    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense 426,357 620,494
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense 378,156 669,605
Selling, general and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense $ 674,968 $ 1,496,395