Revenue Recognition (Tables)

12 Months Ended

Sep. 30, 2020

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).  The table excludes all revenue earned from rental contracts.

	YEAR ENDED SEPTEMBER 30,
	2020		2019
Oil and Gas Markets Product and Services Revenue:
Traditional exploration	$	5,849	$	8,712
Wireless exploration		1,421		4,362
Reservoir		805		2,554
Total revenue		8,075		15,628
Adjacent Markets Product and Services Revenue:
Industrial		15,622		18,324
Imaging		9,705		11,736
Total revenue		25,327		30,060
Emerging Markets Product and Services Revenue:
Revenue	734		159
Total	$	34,136	$	45,847

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,
	2020		2019
Asia	$	3,613	$	6,025
Canada		2,054		2,558
Europe		4,813		6,569
United States		22,294		28,763
Other		1,362		1,932
	$	34,136	$	45,847