Stock-Based Compensation - Summary of Granted and Outstanding Shares (Details) - shares	Sep. 30, 2023	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	2,263,477	2,721,384
Total (in shares)	6,505,117
2004 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	0
Total (in shares)	0
2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	1,522,207
Total (in shares)	3,408,707
2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	33,838
Total (in shares)	1,705,153
Inducement Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	707,432
Total (in shares)	1,391,257
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award (in shares)	4,241,640	4,069,931
Restricted Stock Units (RSUs) | 2004 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award (in shares)	0
Restricted Stock Units (RSUs) | 2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award (in shares)	1,886,500
Restricted Stock Units (RSUs) | 2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award (in shares)	1,671,315
Restricted Stock Units (RSUs) | Inducement Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award (in shares)	683,825