Stock-Based Compensation - Stock Option Activity under Two Thousand Six Plan (Details) - Employee Stock Plan, 2006 Plan	9 Months Ended
	Oct. 29, 2016 USD ($) $ / shares shares
Number of Shares
Outstanding options at beginning of year | shares	2,728,621
Options canceled | shares	(77,394)
Outstanding options at end of quarter | shares	2,651,227
Options exercisable at end of quarter | shares	1,063,848
Weighted-average exercise price per option
Outstanding options at beginning of year | $ / shares	$ 5.00
Options canceled | $ / shares	5.04
Outstanding options at end of quarter | $ / shares	4.99
Options exercisable at end of quarter | $ / shares	$ 4.86
Weighted-average remaining contractual term
Outstanding options at end of quarter	6 years 3 months 18 days
Options exercisable at end of quarter	5 years 6 months
Aggregate Intrinsic Value
Outstanding options at end of quarter | $	$ 123,181
Options exercisable at end of quarter | $	$ 123,181