EMPLOYEE STOCK PLANS - Schedule of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 27, 2015 USD ($) $ / shares shares
Number of Shares
Outstanding beginning balance (in shares) | shares	4,920
Granted (in shares) | shares	711
Exercised (in shares) | shares	(911)
Forfeited or expired (in shares) | shares	(394)
Outstanding ending balance (in shares) | shares	4,326
Exercisable (in shares) | shares	2,738
Weighted-Average Exercise Price
Weighted-Average Exercise Price, Outstanding beginning balance (in usd per share)	$ 2.01
Weighted Average Exercise Price, Granted (in usd per share)	3.38
Weighted Average Exercise Price, Exercised (in usd per share)	2.00
Weighted Average Exercise Price, Forfeited or expired (in usd per share)	4.26
Weighted-Average Exercise Price, Outstanding ending balance (in usd per share)	2.03
Weighted Average Exercise Price, Exercisable (in usd per share)	$ 1.77
Weighted Average Remaining Term
Weighted Average Remaining Term, Outstanding	4 years 4 months
Weighted Average Remaining Term, Exercisable	3 years 7 months
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding | $	$ 2,226
Aggregate Intrinsic Value, Exercisable | $	$ 1,811