Sales and Major Customers - Summary of Company's Revenues from Customers by Geographic Region, Outside the U.S. (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 44,503	$ 70,591	$ 80,422
Canada [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	1,354	7,376	13,113
UK and Europe [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	16,437	17,427	23,456
Latin America [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	3,283	12,706	7,529
Asia/South Pacific [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	16,623	18,407	25,256
Eurasia [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	3,659	5,853	6,810
Other [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 3,147	$ 8,822	$ 4,258