Balance Sheet - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Inventory, Net [Abstract]
Raw materials	$ 5,880	$ 7,314
Finished goods	6,126	4,967
Work in progress	1,426	1,563
Cost of inventories	13,432	13,844
Less allowance for obsolescence	(911)	(900)
Total inventories, net	$ 12,521	$ 12,944