Consolidated Statements of Stockholders' (Deficit) Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Feb. 01, 2014	$ 33,551	$ 367	$ 1,008,549	$ (975,300)	$ (65)
Beginning Balance, shares at Feb. 01, 2014		36,723,727
Comprehensive income (loss):
Net (loss) income	35,723			35,723
Share-based compensation expense	1,896		1,896
Exercise of stock options	175		175
Exercise of stock options, shares		22,018
Restricted stock unit vestings	0	$ 0	0	0	0
Restricted stock unit vestings, shares		2,500
Tax receivable agreement obligation adjustment	624		624
Ending Balance at Jan. 31, 2015	71,969	$ 367	1,011,244	(939,577)	(65)
Ending Balance, shares at Jan. 31, 2015		36,748,245
Comprehensive income (loss):
Net (loss) income	5,099			5,099
Share-based compensation expense	1,259		1,259
Exercise of stock options	175	$ 1	174
Exercise of stock options, shares		26,209
Restricted stock unit vestings	0	$ 0	0	0	0
Restricted stock unit vestings, shares		4,963
Ending Balance at Jan. 30, 2016	$ 78,502	$ 368	1,012,677	(934,478)	(65)
Ending Balance, shares at Jan. 30, 2016	36,779,417	36,779,417
Comprehensive income (loss):
Net (loss) income	$ (162,659)			(162,659)
Common stock issuance, net of certain costs	64,110	$ 118	63,992
Common stock issuance, net of certain costs, shares		11,818,181
Share-based compensation expense	$ 1,344		1,344
Exercise of stock options, shares	807,545
Exercise of stock options and issuance of common stock under employee stock purchase plan	$ 4,722	$ 8	4,714
Exercise of stock options and issuance of common stock under employee stock purchase plan, shares		815,428
Restricted stock unit vestings	0	$ 0	0	0	0
Restricted stock unit vestings, shares		14,580
Ending Balance at Jan. 28, 2017	$ (13,981)	$ 494	$ 1,082,727	$ (1,097,137)	$ (65)
Ending Balance, shares at Jan. 28, 2017	49,427,606	49,427,606