Stock Option Activity under Two Thousand Six Plan (Detail) (Employee Stock Plan, 2006 Plan, USD $)	6 Months Ended
	Aug. 02, 2014
Employee Stock Plan, 2006 Plan
Number of Shares
Outstanding at beginning of year	2,721,569
Options granted	106,882
Options canceled	(87,306)
Options exercised	(16,224)	[1]
Outstanding at end of quarter	2,724,921
Options exercisable at end of quarter	340,069
Weighted-average Exercise price per Option
Outstanding at beginning of year	$ 4.95
Options granted	$ 5.29
Options canceled	$ 5.04
Options exercised	$ 5.04	[1]
Outstanding at end of quarter	$ 4.96
Options exercisable at end of quarter	$ 4.50
Weighted-average Remaining Contractual Term
Outstanding options at end of quarter	8 years 4 months 24 days
Options exercisable at end of quarter	5 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding options at end of quarter	$ 671,295
Options exercisable at end of quarter	$ 329,714

[1] The intrinsic value of options exercised was immaterial.