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, 2017	Jan. 31, 2016	Jan. 31, 2015
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 34,747	$ 44,503	$ 70,591
Canada [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	1,891	1,354	7,376
UK and Europe [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	14,577	16,437	17,427
Latin America [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	2,983	3,283	12,706
Asia/South Pacific [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	10,348	16,623	18,407
Eurasia [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	3,120	3,659	5,853
Other [Member]
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 1,828	$ 3,147	$ 8,822