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Sale of Subsidiary (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2019 | Jan. 31, 2021 | Sep. 09, 2021 | Aug. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of subsidiary |  |  | $ 4,500 |
Seismic Asia Pacific Pty Ltd | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of subsidiary | $ 660,000 |  |  |
Proceeds in cash from sale of subsidiary | $ 240,000 |  |  |
Note receivable term (in years) | 2 years |  |  |
Proceeds in note receivable from sale of subsidiary | $ 420,000 |  |  |
Working capital adjustment |  |  |  | $ 114,000
Proceeds from note receivable |  | $ 124,000 |  |

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