Leases - Additional Information (Details) - USD ($)	1 Months Ended							3 Months Ended			9 Months Ended
	Jun. 30, 2023	Aug. 31, 2022	Oct. 31, 2021	Jul. 31, 2021	Jan. 31, 2021	May 31, 2020	May 31, 2018	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Apr. 30, 2023	Mar. 31, 2023
Lessee Lease Description [Line Items]
Rent expense								$ 2,700,000		$ 2,800,000	$ 8,200,000	$ 8,200,000
Weighted-average remaining lease term								10 years			10 years
Cash paid for operating leases											$ 500,000
Weighted-average discount rate								9.80%			9.80%
Lessee, operating lease, term of contract				12 years
Cash received for tenant improvement allowances to be repaid	$ 4,400,000			$ 4,400,000
Cash received for operating leases												6,600,000
Cash received related to tenant improvement allowance reimbursement											$ 7,800,000	9,500,000
Right-of-use asset impairment								$ 0	$ 4,100,000		4,100,000
Rent payments											8,300,000	$ 2,900,000
Maximum
Lessee Lease Description [Line Items]
Tenant improvement allowances yet to receive				$ 25,200,000
Letter of Credit
Lessee Lease Description [Line Items]
Security deposit								$ 1,600,000			$ 1,600,000
Letter of credit													$ 2,700,000
Third amendment
Lessee Lease Description [Line Items]
Operating lease, description											The lease amendment for this additional space commenced in April 2021 and expires in March 2024
Lease expiration month and year					2024-03
Initial Lease Agreement And Additional Lease Agreement
Lessee Lease Description [Line Items]
Amount held as collateral for letters of credit issued to landlord														$ 2,700,000
Second Amendment Of Additional Lease Agreement
Lessee Lease Description [Line Items]
Additional tenant improvement allowances		$ 15,000,000
Tenant improvement allowances yet to receive		$ 25,200,000
Initial Lease Agreement
Lessee Lease Description [Line Items]
Lease expiration year			2029			2029
Operating lease, existence of option to extend			true			true
Lessee option to extend description			The lease amendment of this additional space commenced in April 2022 and expires in January 2029. The lease amendment also includes this additional space in the Company’s option to extend the amended Initial Lease Agreement for an additional seven-year term.								The lease amendment also includes an extension of the lease term for the existing office and laboratory space beginning on May 1, 2020 and expiring in January 2029. The amendment to the Initial Lease Agreement also includes an option to extend the lease for an additional seven-year term
Lease term						8 years
Corporate Office and Laboratory Space
Lessee Lease Description [Line Items]
Lease expiration year							2025
Corporate Office and Laboratory Space | Initial Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, existence of option to extend							true
Lessee option to extend description											In April 2019, the Company executed the first amendment to the Initial Lease Agreement for additional corporate space, laboratory space and manufacturing capabilities and an extension to the lease term through April 2026.
Renewal term						7 years