Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Net revenue	$ 53,784	$ 54,394	$ 133,467	$ 160,696
Cost of revenue	27,272	23,311	64,841	74,601
Gross profit	26,512	31,083	68,626	86,095
Operating expenses
Research and development	16,603	17,555	50,158	56,528
Sales and marketing	5,559	5,608	16,484	16,817
General and administrative	4,808	5,212	14,394	14,911
Restructuring costs	(18)	1,104	1,002	1,994
Impairment of IP, mask sets and design tools	856	150	2,122	338
Total operating expenses	27,808	29,629	84,160	90,588
(Loss) income from operations	(1,296)	1,454	(15,534)	(4,493)
Gain on sale of development project				1,079
Interest and other income (expense), net	188	(254)	508	558
(Loss) income before income taxes	(1,108)	1,200	(15,026)	(2,856)
(Benefit from) provision for income taxes	(551)	4,178	3,065	9,446
Net loss	$ (557)	$ (2,978)	$ (18,091)	$ (12,302)
Net loss per common share:
Basic (in dollars per share)	$ (0.02)	$ (0.09)	$ (0.52)	$ (0.36)
Diluted (in dollars per share)	$ (0.02)	$ (0.09)	$ (0.52)	$ (0.36)
Basic (in shares)	34,790	34,518	34,578	34,129
Diluted (in shares)	34,790	34,518	34,578	34,129