Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 29, 2016	Jul. 31, 2015	Jul. 29, 2016	Jul. 31, 2015
Income Statement [Abstract]
Net revenue	$ 103,653	$ 79,855	$ 203,446	$ 157,254
Cost of revenue	52,907	44,717	102,756	88,713
Gross margin	50,746	35,138	100,690	68,541
Research and development	12,848	12,643	26,444	24,473
Sales and marketing	28,639	26,696	56,135	48,815
General and administrative	29,306	28,148	57,158	53,932
Total operating expenses	70,793	67,487	139,737	127,220
Operating loss	(20,047)	(32,349)	(39,047)	(58,679)
Interest and other, net	851	303	1,216	(515)
Loss before income taxes	(19,196)	(32,046)	(37,831)	(59,194)
Income tax benefit	(7,145)	(10,922)	(14,153)	(20,240)
Net loss	$ (12,051)	$ (21,124)	$ (23,678)	$ (38,954)
Loss per common share, basic and diluted (usd per share)	$ (0.15)	$ (0.30)	$ (0.31)	$ (0.56)
Weighted average number of shares outstanding, basic and diluted (in shares)	80,009	70,000	75,169	70,000