Net Income Per Share - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 1,554	$ 2,437	$ 4,226	$ 5,221
Weighted-average shares used to compute net income (loss) per share, basic (in shares)	53,040	52,265	52,958	52,275
Dilutive shares from stock options and RSUs (in shares)	1,569	1,056	1,512	813
Weighted-average shares used to compute net income (loss) per share, diluted (in shares)	54,609	53,321	54,470	53,088
Net income (loss) per share, basic (in usd per share)	$ 0.03	$ 0.05	$ 0.08	$ 0.10
Net income (loss) per share, diluted (in usd per share)	$ 0.03	$ 0.05	$ 0.08	$ 0.10