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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 17,679	$ 6,975	$ 66,005	$ 25,575
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	17,679	6,975	66,005	25,575
Operating Segments | Oil and Gas Markets
Disaggregation Of Revenue [Line Items]
Total revenue	7,284	1,802	32,224	6,789
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	1,949	1,162	3,736	4,749
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	4,264	453	26,923	1,336
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	1,071	187	1,565	704
Operating Segments | Adjacent Markets
Disaggregation Of Revenue [Line Items]
Total revenue	9,334	5,085	23,758	18,229
Operating Segments | Adjacent Markets | Industrial Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	6,451	3,403	15,835	11,185
Operating Segments | Adjacent Markets | Imaging Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	2,883	1,682	7,923	7,044
Operating Segments | Emerging Markets
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,061	$ 88	$ 10,023	$ 557