Sales and Major Customers - Summary of Company's Revenues from Customers by Geographic Region, Outside the U.S. (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Sales Information [Line Items]
Total revenues from customers	$ 70,591	$ 80,422	$ 81,317
Canada [Member]
Sales Information [Line Items]
Total revenues from customers	7,376	13,113	13,744
UK and Europe [Member]
Sales Information [Line Items]
Total revenues from customers	17,427	23,456	27,174
Latin America [Member]
Sales Information [Line Items]
Total revenues from customers	12,706	7,529	15,575
Asia/South Pacific [Member]
Sales Information [Line Items]
Total revenues from customers	18,407	25,256	14,173
Eurasia [Member]
Sales Information [Line Items]
Total revenues from customers	5,853	6,810	4,052
Other [Member]
Sales Information [Line Items]
Total revenues from customers	$ 8,822	$ 4,258	$ 6,599