Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013
Net revenue	$ 42,810	$ 53,762	$ 79,683	$ 106,302
Cost of revenue	20,921	25,696	37,569	51,290
Gross profit	21,889	28,066	42,114	55,012
Operating expenses
Research and development	16,452	18,769	33,555	38,973
Sales and marketing	5,475	5,527	10,925	11,209
General and administrative	4,555	4,937	9,586	9,699
Restructuring costs	46	680	1,020	890
Impairment of IP, mask sets and design tools	1,156		1,266	188
Total operating expenses	27,684	29,913	56,352	60,959
Loss from operations	(5,795)	(1,847)	(14,238)	(5,947)
Gain on sale of development project				1,079
Interest and other income, net	372	121	320	812
Loss before income taxes	(5,423)	(1,726)	(13,918)	(4,056)
Provision for income taxes	2,197	3,065	3,616	5,268
Net loss	$ (7,620)	$ (4,791)	$ (17,534)	$ (9,324)
Net loss per common share:
Basic (in Dollars per share)	$ (0.22)	$ (0.14)	$ (0.51)	$ (0.27)
Diluted (in Dollars per share)	$ (0.22)	$ (0.14)	$ (0.51)	$ (0.27)
Shares used in computing net loss per share:
Basic (in Shares)	34,622	34,259	34,459	34,008
Diluted (in Shares)	34,622	34,259	34,459	34,008