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, 2020	Jan. 31, 2019	Jan. 31, 2018
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 35,863	$ 36,597	$ 36,930
UK/Europe
Revenue, Major Customer [Line Items]
Total revenues from customers	20,366	15,200	11,835
Canada
Revenue, Major Customer [Line Items]
Total revenues from customers	3,731	2,049	807
Latin America
Revenue, Major Customer [Line Items]
Total revenues from customers	2,663	1,267	1,354
Asia/South Pacific
Revenue, Major Customer [Line Items]
Total revenues from customers	6,871	13,555	16,768
Eurasia
Revenue, Major Customer [Line Items]
Total revenues from customers	290	1,803	332
Other
Revenue, Major Customer [Line Items]
Total revenues from customers	$ 1,942	$ 2,723	$ 5,834