Consolitated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Net revenue	$ 182,617	$ 286,915	$ 206,083
Cost of revenue	105,241	146,271	114,381
Gross profit	77,376	140,644	91,702
Operating expenses:
Research and development	86,517	77,270	52,644
Sales and marketing	34,467	31,712	17,617
General and administrative	20,829	18,745	18,240
Impairment of goodwill	45,108
Impairment of intangible assets	66,170
Total operating expenses	253,091	127,727	88,501
Income (loss) from operations	(175,715)	12,917	3,201
Interest and other income, net	2,704	2,183	1,906
Impairment of investment		(5,203)
Income (loss) before income taxes	(173,011)	9,897	5,107
Provision for (benefit from) income taxes	(4,966)	750	2,652
Net income (loss)	$ (168,045)	$ 9,147	$ 2,455
Net income (loss) per share:
Basic (in Dollars per share)	$ (5.25)	$ 0.29	$ 0.09
Diluted (in Dollars per share)	$ (5.25)	$ 0.29	$ 0.09
Shares used in computing net income (loss) per share:
Basic (in Shares)	32,036	31,245	27,597
Diluted (in Shares)	32,036	31,732	28,235