SUPPLEMENTARY FINANCIAL INFORMATION - Schedule of Selected Unaudited Financial Data for Each Quarter (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
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 32,049	$ 38,894	$ 43,334	$ 58,254	$ 54,747	$ 38,430	$ 42,029	$ 43,198	$ 172,532	$ 178,404	$ 119,434
Gross margin	13,787	13,547	16,019	21,394	17,877	12,998	13,296	14,646	64,747	58,817	37,406
Income (loss) from operations	(162)	1,702	2,677	7,303	4,817	546	2,049	2,701	11,520	10,113	(11,013)
Net income (loss)	$ (594)	$ 2,023	$ 2,581	$ 6,305	$ 4,963	$ 537	$ 1,916	$ 2,465	$ 10,315	$ 9,881	$ (10,975)
Net income (loss) per share:
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)
Shares used in computing net income (loss) per share:
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
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