Net (Loss) Income per Share - Computation of Basic and Diluted Net (Loss) Income per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Numerator:
Net (loss) income	$ 114	$ 516	$ (798)	$ (541)	$ (340)	$ 159	$ 882	$ 62	$ (709)	$ 763	$ 14,138
Denominator:
Weighted average common shares, basic									13,326,883	7,929,364	493,763
Dilutive effect of:
Options to purchase common stock										152,871	78,189
Options to purchase preferred stock										1,209,778	1,209,440
Warrants to purchase common stock										40,752	40,346
Convertible preferred stock										3,563,722	8,503,073
Weighted average common shares outstanding, fully diluted									13,326,883	12,896,487	10,324,811
Basic net (loss) income per share	$ 0.01	$ 0.04	$ (0.06)	$ (0.04)	$ (0.03)	$ 0.01	$ 0.20	$ 0.12	$ (0.05)	$ 0.10	$ 28.63
Diluted net (loss) income per share	$ 0.01	$ 0.04	$ (0.06)	$ (0.04)	$ (0.03)	$ 0.01	$ 0.70	$ 0.01	$ (0.05)	$ 0.06	$ 1.37