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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 01, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, share reserve for issuance (in shares) |  | 4,262,537 |  |  |
Granted (in shares) |  | 0 | 0 |  |
Number of options outstanding (in shares) |  | 1,883,128 |  | 1,978,516 |
Stock-based compensation expense |  | $ 14,175 | $ 17,685 |  |
Restricted stock units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based payment award (in shares) |  | 5,063,774 |  | 4,913,312 |
Stock-based compensation expense |  | $ 14,100 | 16,200 |  |
Weighted average period to recognize pre-tax compensation expense |  | 1 year 6 months |  |  |
Unrecognized pre-tax compensation expense |  | $ 75,300 |  |  |
Options |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Intrinsic value of options exercised |  | 900 | 600 |  |
Stock-based compensation expense |  | $ 100 | 1,500 |  |
Weighted average period to recognize pre-tax compensation expense |  | 4 days |  |  |
2013 Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares reserve for issuance (in shares) |  | 2,855,923 |  |  |
Number of shares forfeited (in shares) |  | 161,085 |  |  |
Number of options outstanding (in shares) |  | 1,248,038 |  |  |
2013 Plan | Restricted stock units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based payment award (in shares) |  | 1,607,885 |  |  |
2021 Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 8,000,000
Number of shares forfeited (in shares) |  | 277,690 |  |  |
Granted (in shares) |  | 4,176,238 |  |  |
Number of options outstanding (in shares) |  | 32,151 |  |  |
2021 Plan | Restricted stock units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based payment award (in shares) |  | 2,943,382 |  |  |
Inducement Awards |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  | 832,950 |  |  |
Common stock, share reserve for issuance (in shares) |  | 453,601 |  |  |
Granted (in shares) |  | 428,800 |  |  |
Number of options outstanding (in shares) |  | 602,939 |  |  |
Inducement Awards | Restricted stock units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based payment award (in shares) |  | 183,750 |  |  |
Visirna ESOP |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | 20,000,000 |  |  |  |
Granted (in shares) | 7,500,000 |  |  |  |
Stock-based compensation expense |  | $ 1,000 | $ 2,000 |  |

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