STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 2,337,000	$ 2,269,000
Unrecognized total compensation cost
Unrecognized stock-based compensation expense related to non-vested stock-based awards	11,300,000
Weighted-average period over which unrecognized stock-based compensation cost is expected to be recognized	1 year 8 months 12 days
Cost of sales
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	212,000	209,000
Selling, general and administrative expenses
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	1,836,000	1,820,000
Research and development expense
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 289,000	$ 240,000