Supplementary Financial Information

12 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Supplementary Financial Information

21.  Supplementary Financial Information

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

	Years Ended September 30,
	2020			2019			2018
Balance at beginning of year	$	172		$	454		$	356
Provision		86			200			102
Write offs		(26	)		(402	)		(9	)
Adjustment (1)		(73	)		(80	)		5
Balance at end of year	$	159		$	172		$	454

(1) Primarily foreign currency translation adjustments.