Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Jan. 01, 2011		Jan. 02, 2010
Revenue:
Product revenue	$ 426,525		$ 360,394		$ 262,199
Contract revenue	38,975		40,558		36,418
Total revenue	465,500		400,952		298,617
Cost of revenue:
Cost of product revenue (1)	246,905	[1]	228,403	[1]	176,631	[1]
Cost of contract revenue (1)	26,477	[1]	27,117	[1]	30,790	[1]
Total cost of revenue	273,382		255,520		207,421
Gross margin	192,118		145,432		91,196
Operating expenses:
Research and development (1)	36,498	[1]	24,809	[1]	14,747	[1]
Selling and marketing (1)	58,544	[1]	50,535	[1]	40,902	[1]
General and administrative (1)	43,753	[1]	36,618	[1]	30,110	[1]
Total operating expenses	138,795		111,962		85,759
Operating income	53,323		33,470		5,437
Other income (expense), net	218		504		(81)
Income before income taxes	53,541		33,974		5,356
Income tax expense	13,350		8,460		2,026
Net income (loss)	40,191		25,514		3,330
Net income per share
Basic	$ 1.50		$ 1.00		$ 0.13
Diluted	$ 1.44		$ 0.96		$ 0.13
Number of shares used in per share calculations
Basic	26,712		25,394		24,998
Diluted	27,924		26,468		25,640
Stock-based compensation recorded in fiscal 2011, 2010 and 2009 breaks down by expense classification as follows:
Stock based compensation	8,784		8,165		7,562
Cost of Product Revenue
Stock-based compensation recorded in fiscal 2011, 2010 and 2009 breaks down by expense classification as follows:
Stock based compensation	1,197	[1]	1,311	[1]	1,127	[1]
Cost of Contract Revenue
Stock-based compensation recorded in fiscal 2011, 2010 and 2009 breaks down by expense classification as follows:
Stock based compensation	478	[1]	446	[1]	575	[1]
Research and Development Expense
Stock-based compensation recorded in fiscal 2011, 2010 and 2009 breaks down by expense classification as follows:
Stock based compensation	743	[1]	725	[1]	351	[1]
Selling and Marketing Expense
Stock-based compensation recorded in fiscal 2011, 2010 and 2009 breaks down by expense classification as follows:
Stock based compensation	724	[1]	1,161	[1]	1,410	[1]
General and Administrative Expense
Stock-based compensation recorded in fiscal 2011, 2010 and 2009 breaks down by expense classification as follows:
Stock based compensation	$ 5,642	[1]	$ 4,522	[1]	$ 4,099	[1]

[1] Stock-based compensation recorded in fiscal 2011, 2010 and 2009 breaks down by expense classification as follows: