Concentrations - Additional Information (Detail) $ in Millions |
12 Months Ended | |
|---|---|---|
|
Jan. 31, 2018
USD ($)
Customer
Supplier
|
Jan. 31, 2017
USD ($)
Customer
|
|
| Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] | ||
| Minimum rate of consolidated accounts receivable | 10.00% | 10.00% |
| Foreign bank deposits | $ 3.9 | |
| 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] | ||
| Aggregate amount of accounts receivable from customers | $ 5.8 | $ 5.1 |
| Concentration risk number of customer | Customer | 3 | 3 |