Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 28, 2017 USD ($) $ / shares shares
Options
Outstanding - beginning of period | shares	1,213
Granted | shares	2,211
Exercised | shares	(1,068)	[1]
Cancelled | shares	(42)
Outstanding- end of period | shares	2,314
Vested and expected to vest-end of period | shares	2,133
Exercisable-end of period | shares	39	[2]
Weighted-Average Exercise Price
Outstanding-beginning of period | $ / shares	$ 14.83
Granted | $ / shares	15.35
Exercised | $ / shares	14.83	[1]
Cancelled | $ / shares	14.50
Outstanding-end of period | $ / shares	15.33
Vested and expected to vest-end of period | $ / shares	15.33
Exercisable-end of period | $ / shares	$ 12.10	[2]
Weighted-Average Remaining Contractual Term (In years)
Outstanding-end of period	6 years 1 month 6 days
Vested and expected to vest-end of period	6 years
Exercisable-end of period	9 months 18 days	[2]
Aggregate Intrinsic Value
Outstanding-end of period | $	$ 108
Vested and expected to vest-end of period | $	107
Exercisable-end of period | $	$ 99	[2]

[1] Options exercised during Fiscal 2016 ranged in price from $11.51 to $15.81.

[2] Options exercisable represent “in-the-money” vested options based upon the weighted average exercise price of vested options compared to the Company’s stock price at January 28, 2017.