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
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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Notes Receivable Term

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

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The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

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The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

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