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Sale of Subsidiaries (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
payment
Apr. 30, 2019
USD ($)
Jul. 31, 2019
USD ($)
Seismic Asia Pacific Pty Ltd      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of subsidiary   $ 660  
Proceeds in cash from sale of subsidiary   $ 240  
Note receivable term (in years)   2 years  
Proceeds in note receivable from sale of subsidiary   $ 420  
Working capital adjustment   $ 114  
Mitcham Seismic Eurasia LLC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of subsidiary $ 1,200    
Proceeds in cash from sale of subsidiary     $ 495
Number of payments | payment 8    
Interest rate on payments due from sale of subsidiary 9.00%    
Loss on sale subsidiary $ 4,900    
Cumulative translation loss $ 5,400