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Stock-Based Compensation - Summary of Granted and Outstanding Shares (Details) - shares | Mar. 31, 2023 | Sep. 30, 2022
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Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of options outstanding (in shares) | 2,582,317 | 2,721,384
Total (in shares) | 6,912,660 |
2004 Equity Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of options outstanding (in shares) | 173,983 |
Total (in shares) | 173,983 |
2013 Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of options outstanding (in shares) | 1,629,457 |
Total (in shares) | 3,518,957 |
2021 Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of options outstanding (in shares) | 35,151 |
Total (in shares) | 1,737,119 |
Inducement Awards |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of options outstanding (in shares) | 743,726 |
Total (in shares) | 1,482,601 |
Restricted Stock Units (RSUs) |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based payment award (in shares) | 4,330,343 | 4,069,431
Restricted Stock Units (RSUs) | 2004 Equity Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based payment award (in shares) | 0 |
Restricted Stock Units (RSUs) | 2013 Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based payment award (in shares) | 1,889,500 |
Restricted Stock Units (RSUs) | 2021 Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based payment award (in shares) | 1,701,968 |
Restricted Stock Units (RSUs) | Inducement Awards |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based payment award (in shares) | 738,875 |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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