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Risks and Uncertainties - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 USD ($) Customer | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) Customer | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($)
Concentration Risk [Line Items] |  |  |  |  |
Revenue | $ 21,565 | $ 21,604 | $ 34,597 | $ 48,326 |
Geospace Technologies Eurasia LLC |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of ownership interest or majority of voting interests subject to sanctions |  |  | 33.00% |  |
Imported product for resale. |  |  |  |  | $ 1,200
Net carrying value of subsidiary | 4,300 |  | $ 4,300 |  |
Cash | 1,000 |  | 1,000 |  |
Revenue from domestic sales |  |  |  |  | $ 1,800
Customer one |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Trade accounts and financing receivables | 10,500 |  | 10,500 |  |
Customer two |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Trade accounts and financing receivables | 4,200 |  | 4,200 |  |
Customer three |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Trade accounts and financing receivables | $ 4,800 |  | $ 4,800 |  |
Customer Concentration Risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers | Customer | 3 |  | 3 |  |
Sales Revenue, Net | Customer Concentration Risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers | Customer | 3 |  | 3 |  |
Sales Revenue, Net | Trade Accounts and Financing Receivables | Customer Concentration Risk | Customer one |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue | $ 12,600 |  | $ 15,800 |  |
Sales Revenue, Net | Trade Accounts and Financing Receivables | Customer Concentration Risk | Customer two |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue | 400 |  | 5,000 |  |
Sales Revenue, Net | Trade Accounts and Financing Receivables | Customer Concentration Risk | Customer three |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue | $ 200 |  | $ 900 |  |

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