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Stock-Based Compensation (Tables)
 3 Months Ended
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 Plan2013 Plan2021 PlanInducement AwardsTotal
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,
20232022
Research and development7,823 8,402 
General and administrative9,862 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:
SharesWeighted-
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 
Granted511,29029.48 
Vested(153,457)47.76 
Forfeited(14,775)51.21 
Outstanding at December 31, 2023
4,584,698$55.58