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, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 26,722	$ 9,083
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	26,722	9,083
Operating Segments | Oil and Gas Markets
Disaggregation Of Revenue [Line Items]
Total revenue	11,055	2,914
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	997	2,330
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	10,029	404
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	29	180
Operating Segments | Adjacent Markets
Disaggregation Of Revenue [Line Items]
Total revenue	6,870	6,072
Operating Segments | Adjacent Markets | Industrial Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	4,407	3,596
Operating Segments | Adjacent Markets | Imaging Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	2,463	2,476
Operating Segments | Emerging Markets
Disaggregation Of Revenue [Line Items]
Total revenue	$ 8,797	$ 97