Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 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.

	Three Months Ended				Six Months Ended
	March 31, 2021		March 31, 2020		March 31, 2021		March 31, 2020
Oil and Gas Markets
Traditional exploration product revenue	$	790	$	1,257	$	1,787	$	3,587
Wireless exploration product revenue		12,630		479		22,659		883
Reservoir product revenue		465		337		494		517
Total revenue		13,885		2,073		24,940		4,987
Adjacent Markets
Industrial product revenue		4,977		4,186		9,384		7,782
Imaging product revenue		2,577		2,886		5,040		5,362
Total revenue		7,554		7,072		14,424		13,144
Emerging Markets
Revenue		165		372		8,962		469
Total	$	21,604	$	9,517	$	48,326	$	18,600

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:  

	Three Months Ended				Six Months Ended
	March 31, 2021		March 31, 2020		March 31, 2021		March 31, 2020
Asia	$	1,093	$	830	$	12,466	$	1,275
Canada		481		794		888		1,267
Europe		1,704		1,259		2,879		2,672
United States		18,055		6,184		31,419		12,781
Other		271		450		674		605
Total	$	21,604	$	9,517	$	48,326	$	18,600