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Operating Leases - Additional Information (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Dec. 16, 2021 OfficeSuite | Dec. 16, 2021 ft² | Nov. 17, 2021 USD ($) | Nov. 10, 2021 | May 10, 2021 USD ($) | Jan. 27, 2021 OfficeSuite | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Aug. 31, 2023 USD ($) | Aug. 01, 2023 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of contract |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Lessee, operating lease, option to extend |  |  |  |  |  |  |  |  |  |  | The original term of the lease was from May 11, 2020 to June 30, 2021 with an option to renew. In March 2021, the Company entered into an amendment to the lease agreement and extended the term of the lease to September 30, 2021. |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | $ 13,195 |  | $ 13,195 |  | $ 5,580 | $ 11,574 |  |
Operating lease liability |  |  |  |  |  |  | 53,111 |  | 53,111 |  | 5,794 |  |  |
Current portions of operating lease liability |  |  |  |  |  |  | 3,439 |  | 3,439 |  | 4,045 | 5,482 |  |
Non-current portions of operating lease liability |  |  |  |  |  |  | $ 49,672 |  | $ 49,672 |  | $ 1,749 | 5,794 |  |
Remaining lease term on operating leases |  |  |  |  |  |  | 110 months |  | 110 months |  | 19 months |  |  |
Weighted average incremental borrowing rate on operating lease |  |  |  |  |  |  | 10.90% |  | 10.90% |  | 8.50% |  |  |
Lease expense |  |  |  |  |  |  | $ 2,400 | $ 1,700 | $ 6,400 | $ 5,000 | $ 6,700 | 1,900 |  |
Variable lease payments |  |  |  |  |  |  | 800 | $ 300 | 1,800 | $ 1,000 | 1,300 | 200 |  |
Explora BioLabs, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  |  |  |  | 1,400 |  |  |
Operating lease liability |  |  |  |  |  |  | 0 |  | $ 0 |  | $ 1,200 |  |  |
Lease Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, option to extend |  |  |  |  |  |  |  |  | The term of the lease is 44 months for the first office suite and 43 months for the second office suite with an option to extend the term for an additional two years on the same terms and conditions. |  | the first office suite and 43 months for the second office suite with an option to extend the term for an additional two years on the same terms and conditions. |  |  |
Number of office suites | OfficeSuite |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | 13,200 |  | $ 13,200 |  | $ 4,200 |  |  |
Operating lease liability |  |  |  |  |  |  | 53,100 |  | $ 53,100 |  | 4,500 |  |  |
First Office Suite |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease commencement date |  |  |  | Nov. 10, 2021 |  | Jul. 31, 2021 |  |  |  |  |  |  |  |
Sublease expire date |  |  |  | Dec. 06, 2023 |  |  |  |  |  |  |  |  |  |
Second Office Suite |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease commencement date |  |  |  |  |  | Aug. 31, 2021 |  |  |  |  |  |  |  |
Embedded Lease Agreement | Laboratory For Cell And Gene Medicine |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease maturity date |  |  |  |  | Apr. 30, 2023 |  |  |  |  |  |  |  |  |
Fixed lease payments |  |  |  |  | $ 5,600 |  |  |  |  |  |  |  |  |
License Service Agreement and Master Services Agreement | Explora BioLabs, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease maturity date |  |  | Nov. 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Fixed lease payments |  |  | $ 700 |  |  |  |  |  |  |  |  |  |  |
Bayside Lease [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of contract | 120 months | 120 months |  |  |  |  |  |  |  |  |  |  | 20 months | 20 months
Lessee, operating lease, option to extend |  |  |  |  |  |  |  |  | The term of the lease is 120 months with the option to extend the term up to an additional ten years. |  |  |  |  |
Operating lease liability |  |  |  |  |  |  | 32,000 |  | $ 32,000 |  | 0 | $ 0 |  |
Office And Laboratory Space | 85,165 | 85,165 |  |  |  |  |  |  |  |  |  |  |  |
Leasehold improvements |  |  |  |  |  |  | 27,200 |  | 27,200 |  |  |  |  |
Leasehold tenant improvement allowance |  |  |  |  |  |  |  |  | 14,900 |  | $ 14,900 |  |  |
Leasehold improvements liability utilized and recorded |  |  |  |  |  |  | 14,900 |  | $ 14,900 |  |  |  |  |
Sublease payments |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 | $ 500
Sublease Income |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |

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