Stock-Based Compensation - Schedule of Expenses Included in Operating Expenses (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Stock-based compensation expense | $ 14,175 | $ 17,685 |
| Research and development | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Stock-based compensation expense | 6,846 | 7,823 |
| General and administrative expense | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Stock-based compensation expense | $ 7,329 | $ 9,862 |