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STOCK-BASED COMPENSATION - Expense Related to Employee Stock Options and Nonvested Restricted Common Stock Awards (Details) - USD ($)
3 Months Ended
Mar. 26, 2016
Mar. 28, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense $ 56,454 $ 997,464
Cost of product revenues    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense 142,534 199,239
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense 116,895 234,406
Selling, general and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Allocated Share-based Compensation Expense $ (202,975) $ 563,819