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Basis of Presentation and Significant Accounting Policies - Concentrations of Credit Risk - Additional Information (Details) | 9 Months Ended | 12 Months Ended
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Jun. 30, 2022 | Sep. 30, 2021
US Treasuries and FDIC Insured |  |
Concentration Risk [Line Items] |  |
Percentage of cash balances | 85.00% | 83.00%
Accounts Receivable | Customer Concentration Risk | Customer One |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 17.00% | 14.00%
Accounts Receivable | Customer Concentration Risk | Customer Two |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 10.00% |

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