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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Accounting Policies [Abstract] |  |
Accounts receivable | $ 6,118 | $ 4,384
Allowance for doubtful accounts | (13) | (37)
Accounts receivable, net | $ 6,105 | $ 4,347

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