Balance Sheet - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Inventory, Net [Abstract]
Raw materials	$ 7,289	$ 7,314
Finished goods	4,957	4,967
Work in progress	1,764	1,563
Cost of inventories	14,010	13,844
Less allowance for obsolescence	(994)	(900)
Total inventories, net	$ 13,016	$ 12,944