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Stock-Based Compensation - Expenses Included in Operating Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 16,588 $ 20,613 $ 34,273 $ 40,002
Research and development        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense 7,097 8,745 15,413 17,147
General and administrative expense        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 9,491 $ 11,868 $ 18,860 $ 22,855