Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Net revenue	$ 68,251	$ 46,694	$ 108,509	$ 107,326
Cost of revenue	37,671	33,700	56,834	64,540
Gross profit	30,580	12,994	51,675	42,786
Operating expenses:
Research and development	27,975	21,805	49,764	43,401
Sales and marketing	7,795	8,429	14,683	16,930
General and administrative	9,489	5,197	15,868	10,632
Gain on acquisition	(1,417)		(1,417)
Total operating expenses	43,842	35,431	78,898	70,963
Loss from operations	(13,262)	(22,437)	(27,223)	(28,177)
Interest and other income, net	242	734	733	1,553
Loss before income taxes	(13,020)	(21,703)	(26,490)	(26,624)
Provision for income taxes	398	259	630	1,008
Net loss	$ (13,418)	$ (21,962)	$ (27,120)	$ (27,632)
Net loss per share:
Basic (in Dollars per share)	$ (0.41)	$ (0.69)	$ (0.83)	$ (0.87)
Diluted (in Dollars per share)	$ (0.41)	$ (0.69)	$ (0.83)	$ (0.87)
Shares used in computing net loss per share:
Basic (in Shares)	33,052	31,913	32,857	31,822
Diluted (in Shares)	33,052	31,913	32,857	31,822