Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Net revenue	$ 61,581	$ 53,784	$ 175,800	$ 133,467
Cost of revenue	30,794	27,272	87,141	64,841
Gross profit	30,787	26,512	88,659	68,626
Operating expenses
Research and development	17,339	16,603	49,754	50,158
Sales and marketing	5,875	5,559	16,940	16,484
General and administrative	5,314	4,808	16,091	14,394
Restructuring costs		(18)	9	1,002
Impairment of IP, mask sets and design tools	795	856	1,783	2,122
Total operating expenses	29,323	27,808	84,577	84,160
Income (loss) from operations	1,464	$ (1,296)	4,082	$ (15,534)
Gain on sale of development project	7,551		7,551
Interest and other income, net	37	$ 188	821	$ 508
Income (loss) before income taxes	9,052	(1,108)	12,454	(15,026)
Provision for (benefit from) income taxes	2,617	(551)	6,105	3,065
Net income (loss)	$ 6,435	$ (557)	$ 6,349	$ (18,091)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.18	$ (0.02)	$ 0.18	$ (0.52)
Diluted (in dollars per share)	$ 0.17	$ (0.02)	$ 0.17	$ (0.52)
Shares used in computing net income (loss) per share:
Basic (in shares)	36,046	34,790	35,670	34,578
Diluted (in shares)	36,785	34,790	36,515	34,578