Supplementary Financial Information (Tables)

12 Months Ended

Sep. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Activity in Allowance for Doubtful Accounts

The following is a summary of the activity in our allowance for doubtful accounts (in thousands):

	Years Ended September 30,
	2021			2020			2019
Balance at beginning of year	$	159		$	172		$	454
Provision		44			86			200
Write offs		(2	)		(26	)		(402	)
Adjustment (1)		(13	)		(73	)		(80	)
Balance at end of year	$	188		$	159		$	172

(1) Primarily foreign currency translation adjustments.