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Sale of Subsidiaries (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations
$ in Thousands
1 Months Ended 21 Months Ended
Feb. 28, 2019
USD ($)
Aug. 31, 2018
USD ($)
payment
Apr. 30, 2020
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     $ 705
Number of payments | payment   8  
Interest rate on payments due from sale of subsidiary   9.00%