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Supplementary Financial Information | 12 Months Ended
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Sep. 30, 2022
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, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Balance at beginning of year |  | $ | 188 |  |  | $ | 159 |  |  | $ | 172 |
Provision |  |  | (34 | ) |  |  | 44 |  |  |  | 86 |
Write offs |  |  | 6 |  |  |  | (2 | ) |  |  | (26 | )
Adjustment (1) |  |  | (46 | ) |  |  | (13 | ) |  |  | (73 | )
Balance at end of year |  | $ | 114 |  |  | $ | 188 |  |  | $ | 159 |
(1) Primarily foreign currency translation adjustments. Our net accounts receivable as of September 30, 2022, 2021 and 2020 was $25.0 million, $22.5 million and $11.2 million, respectively.

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