Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Numerator:
Net loss	$ 334	$ 155	$ (678)	$ (943)	$ (1,291)	$ (433)	$ (1,195)	$ (1,888)	$ (1,132)	$ (4,807)	$ (19,157)
Denominator:
Weighted average common shares outstanding, basic and diluted									14,779,117	14,520,834	13,735,897
Basic and diluted net loss per share									$ (0.08)	$ (0.33)	$ (1.39)