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

Amounts due from major customers (those exceeding 10% of consolidated accounts receivable).

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- Definition

Concentration Risk Number Of Customer

+ References

No definition available.

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- Definition

Entity wide accounts receivable major customer percentage.

+ References

No definition available.

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- Definition

Number of suppliers manufacture land based seismic systems and equipment in use.

+ References

No definition available.

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- Definition

The aggregate of all foreign interest-bearing and noninterest-bearing deposit liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(a))
-URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537907-122884

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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