Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Jan. 31, 2015	$ 71,969	$ 37	$ 1,011,574	$ (939,577)	$ (65)
Beginning Balance, shares at Jan. 31, 2015		3,674,824
Comprehensive income (loss):
Net income (loss)	5,099			5,099
Share-based compensation expense	1,259		1,259
Exercise of stock options	175		175
Exercise of stock options, shares		2,620
Restricted stock unit vestings	0	$ 0	0	0	0
Restricted stock unit vestings, shares		497
Ending Balance at Jan. 30, 2016	78,502	$ 37	1,013,008	(934,478)	(65)
Ending Balance, shares at Jan. 30, 2016		3,677,941
Comprehensive income (loss):
Net income (loss)	(162,659)			(162,659)
Common stock issuance, net of certain costs	64,110	$ 12	64,098
Common stock issuance, net of certain costs, shares		1,181,818
Share-based compensation expense	1,344		1,344
Exercise of stock options and issuance of common stock under employee stock purchase plan	4,722		4,722
Exercise of stock options and issuance of common stock under employee stock purchase plan, shares		81,543
Restricted stock unit vestings	0	$ 0	0	0	0
Restricted stock unit vestings, shares		1,458
Ending Balance at Jan. 28, 2017	$ (13,981)	$ 49	1,083,172	(1,097,137)	(65)
Ending Balance, shares at Jan. 28, 2017	4,942,760	4,942,760
Comprehensive income (loss):
Net income (loss)	$ 58,597			58,597
Common stock issuance, net of certain costs	28,973	$ 67	28,906
Common stock issuance, net of certain costs, shares		6,666,666
Share-based compensation expense	1,138		1,138
Exercise of stock options and issuance of common stock under employee stock purchase plan	42		42
Exercise of stock options and issuance of common stock under employee stock purchase plan, shares		4,244
Restricted stock unit vestings	0	$ 0	0	0	0
Restricted stock unit vestings, shares		3,137
Shares cancelled as a result of the reverse stock split		(307)
Cumulative effect of the adoption of new accounting pronouncement			84	(84)
Ending Balance at Feb. 03, 2018	$ 74,769	$ 116	$ 1,113,342	$ (1,038,624)	$ (65)
Ending Balance, shares at Feb. 03, 2018	11,616,500	11,616,500