Stock-Based Compensation - Summary of Granted and Outstanding Awards (Details) - shares	Sep. 30, 2025	Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	1,407,035	1,978,516
Total (in shares)	7,217,386
2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	776,279
Total (in shares)	2,276,279
2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	32,151
Total (in shares)	3,782,222
Inducement Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options (in shares)	598,605
Total (in shares)	1,158,885
Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	5,810,351	4,913,312
Restricted stock units | 2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	1,500,000
Restricted stock units | 2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	3,750,071
Restricted stock units | Inducement Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units (in shares)	560,280