Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 03, 2017	Oct. 28, 2016	Jul. 29, 2016	Apr. 29, 2016	Jan. 29, 2016	Oct. 30, 2015	Jul. 31, 2015	May 01, 2015	Feb. 03, 2017	Jan. 29, 2016	Jan. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 118,948	$ 107,108	$ 103,653	$ 99,793	$ 94,081	$ 88,187	$ 79,855	$ 77,399	$ 429,502	$ 339,522	$ 262,130
Gross margin	62,742	53,471	50,746	49,944	44,450	42,722	35,138	33,403	216,903	155,713	117,284
Net loss	$ (6,817)	$ (7,718)	$ (12,051)	$ (11,627)	$ (14,899)	$ (18,528)	$ (21,124)	$ (17,830)	$ (38,213)	$ (72,381)	$ (38,490)
Net loss per common share, basic and diluted (usd per share)	$ (0.09)	$ (0.10)	$ (0.15)	$ (0.17)	$ (0.21)	$ (0.26)	$ (0.30)	$ (0.25)	$ (0.49)	$ (1.03)	$ (0.55)
Weighted average common shares outstanding, basic and diluted (in shares)	80,009	80,009	80,009	70,330	70,000	70,000	70,000	70,000	77,635	70,000	70,000