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Stock-Based Compensation (Tables) | 3 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of Awards Outstanding | The following table presents a summary of awards outstanding attributable to Arrowhead Pharmaceuticals, Inc.:
|  | As of December 31, 2024
|  | 2013 Plan |  | 2021 Plan |  | Inducement Awards |  | Total
Granted and outstanding awards: |  |  |  |  |  |  |  |
Options |  | 1,248,038 |  |  | 32,151 |  |  | 602,939 |  |  | 1,883,128 |
Restricted stock units |  | 1,607,885 |  |  | 2,943,382 |  |  | 512,507 |  |  | 5,063,774 |
Total |  | 2,855,923 |  |  | 2,975,533 |  |  | 1,115,446 |  |  | 6,946,902 |
Schedule of Share-Based Payment Arrangement, Expensed | The following table summarizes stock-based compensation expenses included in operating expenses:
| Three Months Ended December 31, |
| 2024 |  | 2023 |
| (in thousands) |
Research and development | $ | 6,846 |  |  | $ | 7,823 |  |
General and administrative | 7,329 |  |  | 9,862 |  |
Total | $ | 14,175 |  |  | $ | 17,685 |  |
Schedule of Summarized Information about Stock Options | The following table presents a summary of the stock option activity for the three months ended December 31, 2024:
| Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at September 30, 2024 | 1,978,516 |  | $ | 23.39 |  |  |  |  |
Granted | — |  | — |  |  |  |  |
Cancelled or expired | (25,882) |  | 40.20 |  |  |  |  |
Exercised | (69,506) |  | 9.06 |  |  |  |  |
Outstanding at December 31, 2024 | 1,883,128 |  | $ | 23.69 |  |  | 3.3 |  | $ | 12,408,737 |
Exercisable at December 31, 2024 | 1,882,710 |  | $ | 23.68 |  |  | 3.3 |  | $ | 12,408,737 |
Schedule 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, 2024 | 4,913,312 |  | $ | 49.61 |
Granted | 493,148 |  | 20.20 |
Vested | (209,122) |  | 62.88 |
Forfeited | (133,564) |  | 35.12 |
Outstanding at December 31, 2024 | 5,063,774 |  | $ | 46.58 |

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