Stock-Based Compensation - Schedule of Granted and Outstanding Shares (Details) - shares	Jun. 30, 2025	Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	1,484,623	1,978,516
Total (in shares)	7,465,545
Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	5,980,922	4,913,312
2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	850,117
Total (in shares)	2,350,117
2013 Plan | Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	1,500,000
2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	32,151
Total (in shares)	3,920,811
2021 Plan | Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	3,888,660
Inducement Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	602,355
Total (in shares)	1,194,617
Inducement Awards | Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	592,262