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Sale of Subsidiaries (Details) - Seismic Asia Pacific Pty Ltd - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
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Feb. 28, 2019 | Oct. 31, 2020
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 |
Prepayment received from note |  | $ 125

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