Revenue Recognition - Summary of Revenue from the Sale of Products and Performance of Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 13,463	$ 17,679	$ 48,060	$ 66,005
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	13,463	17,679	48,060	66,005
Operating Segments | Oil and Gas Markets
Disaggregation Of Revenue [Line Items]
Total revenue	2,384	7,284	19,260	32,224
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	1,592	1,949	3,389	3,736
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	100	4,264	14,358	26,923
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	692	1,071	1,513	1,565
Operating Segments | Adjacent Markets
Disaggregation Of Revenue [Line Items]
Total revenue	10,894	9,334	28,179	23,758
Operating Segments | Adjacent Markets | Industrial Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	7,465	6,451	18,471	15,835
Operating Segments | Adjacent Markets | Imaging Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	3,429	2,883	9,708	7,923
Operating Segments | Emerging Markets
Disaggregation Of Revenue [Line Items]
Total revenue	135	$ 1,061	571	$ 10,023
Operating Segments | Corporate
Disaggregation Of Revenue [Line Items]
Total revenue	$ 50		$ 50