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, 2018	Jan. 31, 2017	Jan. 31, 2016
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 36,930	$ 34,747	$ 44,503
UK/Europe
Revenue, Major Customer [Line Items]
Total revenues from customers	11,835	14,577	16,437
Canada
Revenue, Major Customer [Line Items]
Total revenues from customers	807	1,891	1,354
Latin America
Revenue, Major Customer [Line Items]
Total revenues from customers	1,354	2,983	3,283
Asia/South Pacific
Revenue, Major Customer [Line Items]
Total revenues from customers	16,768	10,348	16,623
Eurasia
Revenue, Major Customer [Line Items]
Total revenues from customers	332	3,120	3,659
Other
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 5,834	$ 1,828	$ 3,147