Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2016	Oct. 30, 2015	Oct. 28, 2016	Oct. 30, 2015
Income Statement [Abstract]
Net revenue	$ 107,108	$ 88,187	$ 310,554	$ 245,441
Cost of revenue	53,637	45,465	156,393	134,178
Gross margin	53,471	42,722	154,161	111,263
Research and development	12,181	12,230	38,625	36,703
Sales and marketing	26,424	27,109	82,559	75,924
General and administrative	29,709	28,228	86,867	82,160
Total operating expenses	68,314	67,567	208,051	194,787
Operating loss	(14,843)	(24,845)	(53,890)	(83,524)
Interest and other, net	1,107	(5,724)	2,323	(6,239)
Loss before income taxes	(13,736)	(30,569)	(51,567)	(89,763)
Income tax benefit	(6,018)	(12,041)	(20,171)	(32,281)
Net loss	$ (7,718)	$ (18,528)	$ (31,396)	$ (57,482)
Net loss per common share, basic and diluted (usd per share)	$ (0.10)	$ (0.26)	$ (0.41)	$ (0.82)
Weighted average common shares outstanding, basic and diluted (in shares)	80,009	70,000	76,783	70,000