Consolidated Statement of Shareholders' Equity (USD $)	Total	Common Stock [Member]	Warrant [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit
Total Shareholders' Equity period beginning at Jan. 29, 2011	$ 83,152,000	$ 378,000	$ 602,000	$ 337,421,000	$ (255,249,000)
Common Stock, Shares, Outstanding period beginning at Jan. 29, 2011		37,781,688
Net loss	(48,064,000)				(48,064,000)
Common stock issuances pursuant to equity compensation plans, Shares		601,362
Common stock issuances pursuant to equity compensation plans, Value	1,828,000	6,000		1,822,000
Common stock purchase warrants forfeited	0		(35,000)	35,000
Share-based compensation	5,007,000			5,007,000
Stock Issued During Period, Shares, New Issues		9,487,500
Stock Issued During Period, Value, New Issues	55,500,000	95,000		55,405,000
Stock Issued During Period, Shares, Other		689,655
Stock Issued During Period, Value, Other	4,166,000	7,000		4,159,000
Total Shareholders' Equity period end at Jan. 28, 2012	101,589,000	486,000	567,000	403,849,000	(303,313,000)
Common Stock, Shares, Outstanding period end at Jan. 28, 2012		48,560,205
Net loss	(27,676,000)				(27,676,000)
Common stock issuances pursuant to equity compensation plans, Shares		579,156
Common stock issuances pursuant to equity compensation plans, Value	109,000	5,000		104,000
Common stock purchase warrants forfeited	0		(34,000)	34,000
Share-based compensation	3,257,000			3,257,000
Stock Issued During Period, Value, Other	0
Total Shareholders' Equity period end at Feb. 02, 2013	77,279,000	491,000	533,000	407,244,000	(330,989,000)
Common Stock, Shares, Outstanding period end at Feb. 02, 2013		49,139,361
Net loss	(2,515,000)				(2,515,000)
Common stock issuances pursuant to equity compensation plans, Shares		704,892
Common stock issuances pursuant to equity compensation plans, Value	227,000	7,000		220,000	0
Share-based compensation		0
Share-based compensation	3,217,000	0	0	3,217,000	0
Stock Issued During Period, Value, Other	0
Total Shareholders' Equity period end at Feb. 01, 2014	$ 78,208,000	$ 498,000	$ 533,000	$ 410,681,000	$ (333,504,000)
Common Stock, Shares, Outstanding period end at Feb. 01, 2014		49,844,253