Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Net revenue	$ 220,544	$ 227,250	$ 188,313
Cost of revenue	114,565	114,090	92,967
Gross profit	105,979	113,160	95,346
Operating expenses
Research and development	73,993	68,784	67,482
Sales and marketing	23,300	22,877	22,290
General and administrative	18,860	20,862	19,641
Restructuring costs		9	999
Impairment of IP, mask sets and design tools	1,148	1,783	2,811
Total operating expenses	117,301	114,315	113,223
Loss from operations	(11,322)	(1,155)	(17,877)
Gain on sale of development project		7,551
Impairment of privately-held investments, net of gain on sale	(885)	159	(602)
Interest and other income, net	539	794	1,771
(Loss) income before income taxes	(11,668)	7,349	(16,708)
Provision for income taxes	6,647	7,191	4,993
Net (loss) income	$ (18,315)	$ 158	$ (21,701)
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.49)	$ 0	$ (0.63)
Diluted (in dollars per share)	$ (0.49)	$ 0	$ (0.63)
Shares used in computing net (loss) income per share:
Basic (in shares)	37,429	35,890	34,693
Diluted (in shares)	37,429	36,669	34,693