STOCK-BASED COMPENSATION - Expense Related to Employee Stock Options and Nonvested Restricted Common Stock Awards (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 1,126,957	$ 1,505,832
Cost of product revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	230,333	54,103
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	332,463	52,615
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 564,161	$ 1,399,114