Concentrations - Additional Information (Detail) $ in Millions	12 Months Ended
	Jan. 31, 2020 USD ($) Customer Supplier	Jan. 31, 2019 USD ($) Customer
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Minimum rate of consolidated accounts receivable (as a percent)	10.00%
Foreign bank deposits	$ 2.3
Number of suppliers manufacture land based seismic systems and equipment in use | Supplier	2
Credit Risk
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Concentration risk number of customer | Customer	0	1
Aggregate amount of accounts receivable from customers		$ 2.2