Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 02, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018	Feb. 03, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Quarterly financial results
Net sales	$ 91,291	$ 92,837	$ 96,395	$ 103,227	$ 105,147	$ 96,354	$ 98,280	$ 106,426	$ 383,750	$ 406,207	$ 433,699
Gross profit	44,223	48,656	49,865	55,403	52,959	50,901	52,053	57,939	198,147	213,852	227,428
Net income (loss)	$ (6,402)	$ (4,114)	$ (4,025)	$ 214	$ (10,158)	$ (7,523)	$ (2,774)	$ (1,142)	$ (14,327)	$ (21,597)	$ (32,760)
Net income (loss) per share—Basic	$ (0.46)	$ (0.30)	$ (0.29)	$ 0.02	$ (0.73)	$ (0.55)	$ (0.20)	$ (0.08)	$ (1.03)	$ (1.57)	$ (2.39)
Net income (loss) per share—Diluted	$ (0.46)	$ (0.30)	$ (0.29)	$ 0.02	$ (0.73)	$ (0.55)	$ (0.20)	$ (0.08)	$ (1.03)	$ (1.57)	$ (2.39)