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, 2019	Jan. 31, 2018	Jan. 31, 2017
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 36,597	$ 36,930	$ 34,747
UK/Europe
Revenue, Major Customer [Line Items]
Total revenues from customers	15,200	11,835	14,577
Canada
Revenue, Major Customer [Line Items]
Total revenues from customers	2,049	807	1,891
Latin America
Revenue, Major Customer [Line Items]
Total revenues from customers	1,267	1,354	2,983
Asia/South Pacific
Revenue, Major Customer [Line Items]
Total revenues from customers	13,555	16,768	10,348
Eurasia
Revenue, Major Customer [Line Items]
Total revenues from customers	1,803	332	3,120
Other
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 2,723	$ 5,834	$ 1,828