Stock Incentive Plans - Common stock reserved for future issuance (Details) - shares	Jun. 30, 2022	May 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	17,816,576
Balance at September 30, 2021	17,816,576
2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	7,500,000
Balance at September 30, 2021	7,500,000
2021 ESPP Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance		730,000
Stock Options Issued and Outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	9,334,371
Balance at September 30, 2021	9,334,371
Authorized For Future Options Grants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	7,261,233
Balance at September 30, 2021	7,261,233
Authorized for issuance under the ESPP Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	1,220,972
Balance at September 30, 2021	1,220,972