Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Net revenue	$ 39,508	$ 61,316	$ 79,072	$ 115,091
Cost of revenue	20,688	31,734	41,628	61,508
Gross profit	18,820	29,582	37,444	53,583
Operating expenses
Research and development	17,993	18,836	36,162	37,991
Sales and marketing	5,113	5,939	10,486	11,662
General and administrative	4,945	4,820	10,155	9,958
Restructuring charges	1,723		1,966
Impairment of IP		300	3,006	300
Total operating expenses	29,774	29,895	61,775	59,911
Loss from operations	(10,954)	(313)	(24,331)	(6,328)
Interest and other (expense) income, net	(758)	415	(1,223)	(336)
(Loss) income before income taxes	(11,712)	102	(25,554)	(6,664)
Provision for income taxes	965	1,824	1,982	3,156
Net loss	$ (12,677)	$ (1,722)	$ (27,536)	$ (9,820)
Net loss per common share:
Basic (in dollars per share)	$ (0.33)	$ (0.05)	$ (0.72)	$ (0.27)
Diluted (in dollars per share)	$ (0.33)	$ (0.05)	$ (0.72)	$ (0.27)
Shares used in computing net loss per share:
Basic (in shares)	38,289	37,182	38,222	37,028
Diluted (in shares)	38,289	37,182	38,222	37,028