Consolidated Statement of Shareholders' Equity - USD ($)	Total	Common Stock [Member]	Warrant [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit
Common Stock, Shares, Outstanding period beginning at Feb. 01, 2014		49,844,253
Total Shareholders' Equity period beginning at Feb. 01, 2014	$ 78,208,000	$ 498,000	$ 533,000	$ 410,681,000	$ (333,504,000)
Net loss	(1,378,000)	$ 0	0	0	(1,378,000)
Common stock issuances pursuant to equity compensation plans, Shares		1,366,827
Common stock Issuances pursuant to equity compensation plans, Value	2,794,000	$ 13,000	0	2,781,000	0
Share-based payment compensation, Shares		0
Share-based payment compensation, Value	3,860,000	$ 0	0	3,860,000	0
Common stock issuance - warrant exercise, Shares		5,058,741
Common stock issuance - warrant exercise, Value	0	$ 51,000	(533,000)	482,000	0
Common stock issuance, Shares		178,842
Common stock issuance, Value	1,044,000	$ 2,000	0	1,042,000	0
Common Stock, Shares, Outstanding period end at Jan. 31, 2015		56,448,663
Total Shareholders' Equity period end at Jan. 31, 2015	84,528,000	$ 564,000	0	418,846,000	(334,882,000)
Net loss	(12,284,000)	$ 0	0	0	(12,284,000)
Common stock issuances pursuant to equity compensation plans, Shares		721,582
Common stock Issuances pursuant to equity compensation plans, Value	2,460,000	$ 7,000	0	2,453,000	0
Share-based payment compensation, Shares		0
Share-based payment compensation, Value	$ 2,275,000	$ 0	0	2,275,000	0
Common Stock, Shares, Outstanding period end at Jan. 30, 2016	57,170,245	57,170,245.000
Total Shareholders' Equity period end at Jan. 30, 2016	$ 76,979,000	$ 571,000	0	423,574,000	(347,166,000)
Net loss	(8,745,000)	$ 0	0	0	(8,745,000)
Common stock issuances pursuant to equity compensation plans, Shares		423,338
Common stock Issuances pursuant to equity compensation plans, Value	(46,000)	$ 5,000	0	(51,000)	0
Share-based payment compensation, Shares		0
Share-based payment compensation, Value	1,946,000	$ 0	0	1,946,000	0
Common stock and warrant issuance, Shares		7,598,731
Common stock and warrant issuance, Value	$ 11,569,000	$ 76,000	0	11,493,000	0
Common Stock, Shares, Outstanding period end at Jan. 28, 2017	65,192,314	65,192,314.000
Total Shareholders' Equity period end at Jan. 28, 2017	$ 81,703,000	$ 652,000	$ 0	$ 436,962,000	$ (355,911,000)