STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 4,084,000	$ 2,337,000
Unrecognized total compensation cost
Unrecognized stock-based compensation expense related to non-vested stock-based awards	14,500,000
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	396,000	212,000
Selling, general and administrative expenses
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	3,196,000	1,836,000
Research and development expense.
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 492,000	$ 289,000