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
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 13,032	$ 26,722
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	13,032	26,722
Operating Segments | Oil and Gas Markets
Disaggregation Of Revenue [Line Items]
Total revenue	4,765	11,055
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	580	997
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	3,758	10,029
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	427	29
Operating Segments | Adjacent Markets
Disaggregation Of Revenue [Line Items]
Total revenue	8,130	6,870
Operating Segments | Adjacent Markets | Industrial Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	5,014	4,407
Operating Segments | Adjacent Markets | Imaging Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	3,116	2,463
Operating Segments | Emerging Markets
Disaggregation Of Revenue [Line Items]
Total revenue	$ 137	$ 8,797