Balance Sheet - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Inventory, Net [Abstract]
Raw materials	$ 7,620	$ 7,314
Finished goods	5,004	4,967
Work in progress	1,405	1,563
Cost of inventories	14,029	13,844
Less allowance for obsolescence	(938)	(900)
Total inventories, net	$ 13,091	$ 12,944