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, 2014	Jan. 31, 2013	Jan. 31, 2012
Sales Information [Line Items]
Total revenues from customers	$ 80,422	$ 81,317	$ 86,676
Canada [Member]
Sales Information [Line Items]
Total revenues from customers	13,113	13,744	13,243
UK and Europe [Member]
Sales Information [Line Items]
Total revenues from customers	23,456	27,174	21,403
Latin America [Member]
Sales Information [Line Items]
Total revenues from customers	7,529	15,575	17,786
Asia/South Pacific [Member]
Sales Information [Line Items]
Total revenues from customers	25,256	14,173	17,810
Eurasia [Member]
Sales Information [Line Items]
Total revenues from customers	6,810	4,052	3,528
Other [Member]
Sales Information [Line Items]
Total revenues from customers	$ 4,258	$ 6,599	$ 12,906