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Significant Accounting Policies - Additional Information (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) Customer | Sep. 30, 2020 USD ($) Customer
Significant Accounting Policies [Line Items] |  |
Estimated fair value of cash and cash equivalents | $ 69,230 | $ 101,437
ASU 2016-13 |  |
Significant Accounting Policies [Line Items] |  |
Change In Accounting Principle Accounting Standards Update Adopted | true |
Change In Accounting Principle Accounting Standards Update Adoption Date | Oct. 01, 2020 |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect | true |
Concentration of Credit Risk | Accounts Receivable, Net |  |
Significant Accounting Policies [Line Items] |  |
Number of major customers | Customer | 3 | 2
Concentration of Credit Risk | Accounts Receivable, Net | Customer One |  |
Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 19.30% | 14.80%
Concentration of Credit Risk | Accounts Receivable, Net | Customer Two |  |
Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 11.60% | 10.90%
Concentration of Credit Risk | Accounts Receivable, Net | Customer Three |  |
Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 10.30% |
Money-Market Funds | Level 1 |  |
Significant Accounting Policies [Line Items] |  |
Estimated fair value of cash and cash equivalents | $ 56,200 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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