NET INCOME (LOSS) PER SHARE - Schedule of Computation of Net Income (Loss) per Share of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net income (loss)	$ (594)	$ 2,023	$ 2,581	$ 6,305	$ 4,963	$ 537	$ 1,916	$ 2,465	$ 10,315	$ 9,881	$ (10,975)
Denominator:
Weighted-average shares outstanding - basic (in shares)	75,287	75,129	74,920	74,700	73,861	73,731	73,532	66,275	74,916	71,897	58,944
Effect of dilutive stock options and restricted stock units (in shares)									1,899	1,506	0
Weighted-average shares outstanding - diluted (in shares)	75,287	76,546	77,019	77,265	75,486	75,023	74,679	67,971	76,815	73,403	58,944
Net income (loss) per share of common stock:
Basic (in usd per share)	$ (0.01)	$ 0.03	$ 0.03	$ 0.08	$ 0.07	$ 0.01	$ 0.03	$ 0.04	$ 0.14	$ 0.14	$ (0.19)
Diluted (in usd per share)	$ (0.01)	$ 0.03	$ 0.03	$ 0.08	$ 0.07	$ 0.01	$ 0.03	$ 0.04	$ 0.13	$ 0.13	$ (0.19)