Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 03, 2013	Jul. 28, 2012	Aug. 03, 2013	Jul. 28, 2012
Net revenue	$ 53,762	$ 68,251	$ 106,302	$ 108,509
Cost of revenue	25,696	37,671	51,290	56,834
Gross profit	28,066	30,580	55,012	51,675
Operating expenses
Research and development	18,769	27,975	38,973	49,764
Sales and marketing	5,527	7,795	11,209	14,683
General and administrative	4,937	9,489	9,699	15,868
Restructuring costs	680		890
Impairment of IP, mask sets and design tools			188
Gain on acquisition		(1,417)		(1,417)
Total operating expenses	29,913	43,842	60,959	78,898
Loss from operations	(1,847)	(13,262)	(5,947)	(27,223)
Gain on sale of development project			1,079
Interest and other income, net	121	242	812	733
Loss before income taxes	(1,726)	(13,020)	(4,056)	(26,490)
Provision for income taxes	3,065	398	5,268	630
Net loss	$ (4,791)	$ (13,418)	$ (9,324)	$ (27,120)
Net loss per common share:
Basic (in Dollars per share)	$ (0.14)	$ (0.41)	$ (0.27)	$ (0.83)
Diluted (in Dollars per share)	$ (0.14)	$ (0.41)	$ (0.27)	$ (0.83)
Shares used in computing net loss per share:
Basic (in Shares)	34,259	33,052	34,008	32,857
Diluted (in Shares)	34,259	33,052	34,008	32,857