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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Summary of Awards Outstanding | The following table presents a summary of awards outstanding:
| As of March 31, 2024
| 2004 Plan |  | 2013 Plan |  | 2021 Plan |  | Inducement Awards |  | Total
Granted and outstanding awards: |  |  |  |  |  |  |  |  |
Options | — |  |  | 1,358,377 |  |  | 32,151 |  |  | 688,165 |  |  | 2,078,693 |
Restricted stock units | — |  |  | 1,609,510 |  |  | 2,844,090 |  |  | 637,563 |  |  | 5,091,163 |
Total | — |  |  | 2,967,887 |  |  | 2,876,241 |  |  | 1,325,728 |  |  | 7,169,856 |
Share-Based Payment Arrangement, Expensed | The following table summarizes stock-based compensation expenses included in operating expenses:
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
Research and development | $ | 7,097 |  |  | $ | 8,745 |  |  | $ | 15,413 |  |  | $ | 17,147 |
General and administrative | 9,491 |  |  | 11,868 |  |  | 18,860 |  |  | 22,855 |
Total | $ | 16,588 |  |  | $ | 20,613 |  |  | $ | 34,273 |  |  | $ | 40,002 |
Summarized Information about Stock Options | The following table presents a summary of the stock option activity for the six months ended March 31, 2024:
| Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at September 30, 2023 | 2,263,477 |  | $ | 22.68 |  |  |  |  |
Granted | — |  | — |  |  |  |  |
Cancelled or expired | (30,437) |  | 61.11 |  |  |  |  |
Exercised | (154,347) |  | 11.53 |  |  |  |  |
Outstanding at March 31, 2024 | 2,078,693 |  | $ | 23.04 |  |  | 4.0 years |  | $ | 26,788,979 |
Exercisable at March 31, 2024 | 2,054,866 |  | $ | 22.72 |  |  | 3.9 years |  | $ | 26,788,746 |
Summary of Share Activity Related to RSUs | The following table summarizes the activity of the Company’s RSUs:
| Number of RSUs |  | Weighted- Average Grant Date Fair Value Per Share
Outstanding at September 30, 2023 | 4,241,640 |  | $ | 58.43 |
Granted | 1,838,025 |  | 30.75 |
Vested | (876,352) |  | 53.60 |
Forfeited | (112,150) |  | 44.16 |
Outstanding at March 31, 2024 | 5,091,163 |  | $ | 49.58 |

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