Revenue Recognition (Tables)

12 Months Ended

Sep. 30, 2021

Revenue From Contract With Customer [Abstract]

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

For each of the Company’s operating segments, the following table presents revenue only from the sale of products and the performance of services under contracts with customers (in thousands).  Therefore, the table excludes all revenue earned from rental contracts.     

	YEAR ENDED SEPTEMBER 30,
	2021		2020
Oil and Gas Markets
Traditional exploration product revenue	$	4,518	$	5,849
Wireless exploration product revenue		27,016		1,421
Reservoir product revenue		1,877		805
Total revenue		33,411		8,075
Adjacent Markets
Industrial product revenue		21,335		15,622
Imaging product revenue		10,925		9,705
Total revenue		32,260		25,327
Emerging Markets
Revenue		10,193	734
Total	$	75,864	$	34,136

Summary of Revenue from the Sale of Products and Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Geographic Areas

For each of the geographic areas where the Company operates, the following table presents revenue (in thousands) from the sale of products and services under contracts with customers.  The table excludes all revenue earned from rental contracts:  

	YEAR ENDED SEPTEMBER 30,
	2021		2020
Asia	$	17,268	$	3,613
Canada		1,550		2,054
Europe		7,693		4,813
United States		47,101		22,294
Other		2,252		1,362
	$	75,864	$	34,136