Stock-Based Compensation - Option activity (Details) - $ / shares	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Employee Stock Option
Number of Shares
Balance, Beginning (in shares)	1,946,646
Granted (in shares)	1,179,276
Forfeited (in shares)	(304,636)
Expired (in shares)	(4,435)
Balance, Ending (in shares)	2,816,851
Vested and exercisable (in shares)	1,375,258
Weighted Average Exercise Price
Balance, Beginning (in dollars per share)	$ 19.51
Granted (in dollars per share)	5.22
Forfeited (in dollars per share)	10.25
Expired (in dollars per share)	46.78
Balance, Ending (in dollars per share)	14.49
Vested and exercisable (in dollars per share)	$ 22.83
Weighted Average Remaining Contractual Term (Years)
Balance-Remaining contractual term	8 years 2 months 12 days
Vested and exercisable -Remaining contractual term	6 years 8 months 12 days
Grant date fair value of options (in dollars per share)	$ 4.67	$ 5.2
Performance-based stock options
Number of Shares
Balance, Beginning (in shares)	666,500
Forfeited (in shares)	(476,500)
Balance, Ending (in shares)	190,000
Vested and exercisable (in shares)	35,000
Weighted Average Exercise Price
Balance, Beginning (in dollars per share)	$ 7.94
Forfeited (in dollars per share)	6.78
Balance, Ending (in dollars per share)	10.85
Vested and exercisable (in dollars per share)	$ 28.8
Weighted Average Remaining Contractual Term (Years)
Balance-Remaining contractual term	8 years 7 months 6 days
Vested and exercisable -Remaining contractual term	6 years 1 month 6 days