Income Taxes - Components of Income (Loss) Before Income Taxes (Detail) - USD ($) $ 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
Income Tax Disclosure [Abstract]
United States									$ (1,274)	$ (4,201)	$ (3,682)
Foreign									1,753	936	1,256
Income (loss) before taxes	$ 1,150	$ 591	$ (439)	$ (823)	$ (221)	$ (89)	$ (1,041)	$ (1,914)	$ 479	$ (3,265)	$ (2,426)