Income Taxes - Deferred Tax Effects of Temporary Differences Giving Rise to the Company's Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Deferred tax assets:
Net operating loss carryforwards	$ 13,201	$ 11,296
Deferred rent	9,454	10,004
Employee benefit accruals	3,041	3,836
Grow NJ award benefit, net	2,268	2,493
Inventory reserves	2,131	3,320
Federal tax credit carryforwards	1,247	618
Stock-based compensation	855	1,212
Other accruals	1,905	1,896
Other	1,960	2,062
Deferred tax assets (excluding state net operating loss carryforwards)	36,062	36,737
Valuation allowance	(30,402)	(2,666)
Deferred tax asset, net of valuation allowance	5,660	34,071
Deferred tax liabilities:
Depreciation and amortization	(1,860)	(4,570)
Prepaid expenses	(549)	(503)
Deferred tax liabilities, gross	(2,409)	(5,073)
Net deferred tax assets	$ 3,251	$ 28,998