Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Net revenue	$ 199,193	$ 216,613	$ 182,617
Cost of revenue	91,052	125,588	105,241
Gross profit	108,141	91,025	77,376
Operating expenses
Research and development	73,162	103,478	86,517
Sales and marketing	21,637	34,550	34,467
General and administrative	19,640	27,899	20,829
Restructuring costs	2,261	3,264
Impairment of goodwill			45,108
Impairment of acquired intangible assets			66,170
Impairment of IP, mask sets and design tools	1,013	6,569
Gain on acquisition		(1,389)
Total operating expenses	117,713	174,371	253,091
Loss from operations	(9,572)	(83,346)	(175,715)
Gain on sale of development project	1,079
Impairment, net of gain on sale, of privately-held investments, net	(433)
Interest and other income, net	827	2,325	2,704
Loss before income taxes	(8,099)	(81,021)	(173,011)
Provision for (benefit from) income taxes	2,950	20,747	(4,966)
Net loss	$ (11,049)	$ (101,768)	$ (168,045)
Net loss per common share:
Basic (in Dollars per share)	$ (0.32)	$ (3.06)	$ (5.25)
Diluted (in Dollars per share)	$ (0.32)	$ (3.06)	$ (5.25)
Shares used in computing net loss per share:
Basic (in Shares)	34,206	33,205	32,036
Diluted (in Shares)	34,206	33,205	32,036