CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Revenue:
Product	$ 147,178	$ 121,332	$ 413,784	$ 350,322
Services	26,381	20,688	67,989	54,708
Total revenue	173,559	142,020	481,773	405,030
Cost of revenue:
Cost of product	86,703	66,685	251,047	222,330
Cost of services	11,554	6,964	26,765	19,973
Total cost of revenue	98,257	73,649	277,812	242,303
Gross profit	75,302	68,371	203,961	162,727
Operating expenses:
Research and development	35,051	32,528	96,135	93,935
Sales and marketing	20,794	17,720	56,738	52,921
General and administrative	11,977	11,678	36,612	32,976
Total operating expenses	67,822	61,926	189,485	179,832
Income (loss) from operations	7,480	6,445	14,476	(17,105)
Other income (expense), net:
Interest income	373	232	1,046	636
Interest expense	(2,781)	(2,578)	(8,186)	(3,427)
Other gain (loss), net	(24)	(444)	(1,017)	(805)
Total other income (expense), net	(2,432)	(2,790)	(8,157)	(3,596)
Income (loss) before income taxes	5,048	3,655	6,319	(20,701)
Provision for income taxes	205	308	1,070	1,240
Net income (loss)	$ 4,843	$ 3,347	$ 5,249	$ (21,941)
Net income (loss) per common share:
Basic (USD per share)	$ 0.04	$ 0.03	$ 0.04	$ (0.19)
Diluted (USD per share)	$ 0.04	$ 0.03	$ 0.04	$ (0.19)
Weighted average shares used in computing net income (loss) per common share:
Basic weighted average common shares outstanding (in shares)	124,378	118,740	122,953	116,653
Diluted weighted average common shares outstanding (in shares)	128,964	124,679	127,062	116,653