SUPPLEMENTARY FINANCIAL INFORMATION - Schedule of Selected Unaudited Financial Data for Each Quarter (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 54,747	$ 38,430	$ 42,029	$ 43,198	$ 40,783	$ 33,840	$ 24,574	$ 20,237	$ 178,404	$ 119,434	$ 126,526
Gross margin	17,877	12,998	13,296	14,646	13,147	11,424	8,467	4,368	58,817	37,406	44,900
Income (loss) from operations	4,817	546	2,049	2,701	2,029	(230)	(3,059)	(9,753)	10,113	(11,013)	(19,284)
Net income (loss)	$ 4,963	$ 537	$ 1,916	$ 2,465	$ 2,512	$ (412)	$ (3,567)	$ (9,508)	$ 9,881	$ (10,975)	$ (19,319)
Net income per share:
Basic (in usd per share)	$ 0.07	$ 0.01	$ 0.03	$ 0.04	$ 0.04	$ (0.01)	$ (0.06)	$ (0.16)	$ 0.14	$ (0.19)	$ (0.33)
Diluted (in usd per share)	$ 0.07	$ 0.01	$ 0.03	$ 0.04	$ 0.04	$ (0.01)	$ (0.06)	$ (0.16)	$ 0.13	$ (0.19)	$ (0.33)
Shares used in computing net income per share:
Basic (in shares)	73,861,000	73,731,000	73,532,000	66,275,000	59,127,000	59,024,000	58,891,000	58,728,000	71,897,000	58,944,000	58,538,000
Diluted (in shares)	75,486,000.00	75,023,000.00	74,679,000.00	67,971,000.00	60,830,000.00	59,024,000.00	58,891,000.00	58,728,000.00	73,403,000.00	58,944,000.00	58,538,000.00