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