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		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 21,604	$ 9,517	$ 48,326	$ 18,600
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	21,604	9,517	48,326	18,600
Operating Segments | Oil and Gas Markets
Disaggregation Of Revenue [Line Items]
Total revenue	13,885	2,073	24,940	4,987
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	790	1,257	1,787	3,587
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	12,630	479	22,659	883
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	465	337	494	517
Operating Segments | Adjacent Markets
Disaggregation Of Revenue [Line Items]
Total revenue	7,554	7,072	14,424	13,144
Operating Segments | Adjacent Markets | Industrial Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	4,977	4,186	9,384	7,782
Operating Segments | Adjacent Markets | Imaging Product Revenue
Disaggregation Of Revenue [Line Items]
Total revenue	2,577	2,886	5,040	5,362
Operating Segments | Emerging Markets
Disaggregation Of Revenue [Line Items]
Total revenue	$ 165	$ 372	$ 8,962	$ 469