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Supplementary Financial Information | 12 Months Ended
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Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Supplementary Financial Information | 20. Supplementary Financial Information 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.

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