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Sale of Subsidiaries Sale of Subsidiaries (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
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Aug. 31, 2018 | Apr. 30, 2019
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
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 |
Interest rate on payments due from sale of subsidiary | 9.00% |
Loss on sale subsidiary | $ 4,900 |
Cumulative translation loss | $ 5,400 |

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