Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Jan. 31, 2015	39,973,689	(4,659,143)
Balance at Jan. 31, 2015	$ 493,550	$ (88,198)	$ (27)	$ (1,084)	$ (260,951)	$ 143,290
Unrealized loss on marketable securities			(181)			(181)
Currency translation adjustments				(583)		(583)
Stock-based compensation expense	$ 6,559					6,559
Net share settlement of equity awards (in shares)		(16,606)
Net share settlement of equity awards	$ (81)	$ (138)				(219)
Net proceeds from common stock issued under share plans (in shares)	1,450,688
Net proceeds from common stock issued under share plans	$ 3,781					3,781
Net income (loss)					158	158
Balance (in shares) at Jan. 30, 2016	41,424,377	(4,675,749)
Balance at Jan. 30, 2016	$ 503,809	$ (88,336)	(208)	(1,667)	(260,793)	152,805
Unrealized loss on marketable securities			33			33
Currency translation adjustments				(336)		(336)
Stock-based compensation expense	$ 6,505					6,505
Net share settlement of equity awards (in shares)
Net share settlement of equity awards	$ (635)					(635)
Net proceeds from common stock issued under share plans (in shares)	1,381,902
Net proceeds from common stock issued under share plans	$ 3,489					3,489
Net income (loss)					(18,315)	(18,315)
Balance (in shares) at Jan. 28, 2017	42,806,279	(4,675,749)
Balance at Jan. 28, 2017	$ 513,168	$ (88,336)	(175)	(2,003)	(279,108)	143,546
Unrealized loss on marketable securities			5			(5)
Currency translation adjustments				2,191		2,191
Stock-based compensation expense	$ 5,419					5,419
Net share settlement of equity awards (in shares)
Net share settlement of equity awards	$ (413)					(413)
Net proceeds from common stock issued under share plans (in shares)	1,331,738
Net proceeds from common stock issued under share plans	$ 4,811					4,811
Net income (loss)					(120,041)	(120,041)
Cumulative effect adjustment related to recognition of previously unrecognized excess tax benefits from adoption of ASU 2016-09					4,602	4,602
Balance (in shares) at Feb. 03, 2018	44,138,017	(4,675,749)
Balance at Feb. 03, 2018	$ 522,985	$ (88,336)	$ (170)	$ 188	$ (394,547)	$ 40,120