Balance Sheet - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jan. 31, 2014
Inventories:
Raw materials	$ 6,371	$ 4,599
Finished goods	5,376	4,159
Work in progress	1,092	612
Cost of inventories	12,839	9,370
Less allowance for obsolescence	(1,111)	(1,032)
Total inventories, net	$ 11,728	$ 8,338