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	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 64,109	$ 75,864
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	64,109	75,864
Operating Segments | Oil and Gas Markets
Disaggregation Of Revenue [Line Items]
Total revenue	24,348	33,411
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	6,558	4,518
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	15,822	27,016
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	1,968	1,877
Operating Segments | Adjacent Markets
Disaggregation Of Revenue [Line Items]
Total revenue	39,000	32,260
Operating Segments | Adjacent Markets | Industrial Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	25,640	21,335
Operating Segments | Adjacent Markets | Imaging Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	13,360	10,925
Operating Segments | Emerging Markets
Disaggregation Of Revenue [Line Items]
Total revenue	711	$ 10,193
Operating Segments | Corporate
Disaggregation Of Revenue [Line Items]
Total revenue	$ 50