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Stock-Based Compensation (Tables) | 3 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of Awards Outstanding | The following table presents a summary of awards outstanding:
| As of December 31, 2023
| 2004 Plan |  | 2013 Plan |  | 2021 Plan |  | Inducement Awards |  | Total
Granted and outstanding awards: |  |  |  |  |  |  |  |  |
Options | — |  |  | 1,476,799 |  |  | 32,151 |  |  | 691,245 |  |  | 2,200,195 |
Restricted stock units | — |  |  | 1,886,500 |  |  | 2,013,298 |  |  | 684,900 |  |  | 4,584,698 |
Total | — |  |  | 3,363,299 |  |  | 2,045,449 |  |  | 1,376,145 |  |  | 6,784,893 |
Share-Based Payment Arrangement, Expensed | The following table summarizes stock-based compensation expenses included in operating expenses:
| Three Months Ended December 31,
| 2023 |  | 2022
Research and development | 7,823 |  |  | 8,402 |
General and administrative | 9,862 |  |  | 10,987 |
Total | $ | 17,685 |  |  | $ | 19,389 |
Summarized Information about Stock Options | The following table presents a summary of the stock option activity for the three months ended December 31, 2023:
| 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 | (29,457) |  | 61.11 |  |  |  |  |
Exercised | (33,825) |  | 8.30 |  |  |  |  |
Outstanding at December 31, 2023 | 2,200,195 |  | $ | 22.46 |  |  | 4.1 years |  | $ | 31,862,157 |
Exercisable at December 31, 2023 | 2,118,298 |  | $ | 21.72 |  |  | 3.9 years |  | $ | 31,840,866 |
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 | 511,290 |  | 29.48 |
Vested | (153,457) |  | 47.76 |
Forfeited | (14,775) |  | 51.21 |
Outstanding at December 31, 2023 | 4,584,698 |  | $ | 55.58 |

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