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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. 25, 2016
Jun. 27, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense $ 951,053 $ 2,022,043
Cost of product revenues    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense 289,937 461,094
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense 248,848 503,523
Selling, general and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense $ 412,268 $ 1,057,426