Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 4,599	$ 3,103
Finished goods	4,159	3,531
Work in progress	612	627
Cost of inventories	9,370	7,261
Less allowance for obsolescence	(1,032)	(1,073)
Net inventories	$ 8,338	$ 6,188