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Commitments and Contingencies - Additional Information (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
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Aug. 22, 2025 USD ($) | Dec. 17, 2021 USD ($) | Sep. 30, 2025 USD ($) | Feb. 29, 2024 | Sep. 30, 2022 ft² | Jan. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 30, 2021 USD ($) | May 31, 2020 USD ($) | May 31, 2020 GBP (£) | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 ILS (₪) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 ft² | Sep. 30, 2025 | Sep. 30, 2025 m² | Mar. 31, 2025 | Mar. 31, 2024 USD ($) | Dec. 31, 2022 USD ($) | May 31, 2019 ft² | Dec. 17, 2017
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease expense |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  | $ 300,000 | $ 900,000 |  | $ 900,000 |  |  |  |  |  |  |  |
Research collaboration costs |  |  |  |  |  |  |  |  |  |  | 3,271,000 |  | 3,171,000 | 9,491,000 |  | 9,049,000 |  |  |  |  |  |  |  |
Loss on impairment of intangible asset |  |  |  |  |  |  |  |  |  |  | 0 |  | $ 0 | 14,840,000 |  | $ 0 |  |  |  |  |  |  |  |
IPR&D - VAC2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment of intangible asset |  |  |  |  |  |  |  |  |  |  |  | $ 14,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research collaboration costs | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Roche Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment |  | $ 50,000,000 |  |  |  | $ 50,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum milestone payments to be received upon performance conditions |  |  |  |  |  | $ 620,000,000 | $ 620,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Roche Agreement [Member] | Hadasit Medical Research Services and Development Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pay costs percentage |  | 21.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreements With Hadasit and IIA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment percentage |  |  |  |  |  |  |  | 24.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment received |  |  |  |  |  |  |  | $ 12,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants awarded percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Royalty payment percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Upfront and Royalty payment |  |  |  |  |  |  |  | 24.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cap amount |  |  | $ 96,900,000 |  |  |  |  |  |  |  | 96,900,000 |  |  | 96,900,000 |  |  |  |  |  |  |  |  |  |
Sublicensing fee |  | $ 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sublicensing fee percentage |  | 21.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of milestone payments |  | 21.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed signature fee amount |  |  |  |  |  |  |  |  | $ 1,600,000 | £ 1,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligations |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  | 700,000 |  |  |  |  |  |  |  | 700,000 |  |  | 700,000 |  |  |  |  |  |  |  |  |  |
License Agreement [Member] | IPR&D - VAC2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment of intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,800,000 |  |  |  |  |  |  |  |  |  |
Carlsbad Lease [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable area | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,841 |
Base monthly rent |  |  | $ 24,800 |  |  |  |  |  |  |  | 24,800 |  |  | 24,800 |  |  |  |  |  |  |  | $ 26,700 |  |
Lease commencement date |  |  | Dec. 01, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rent increase rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Carlsbad Lease [Member] | Deposits and Other Long-Term Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Security deposit |  |  | $ 17,850 |  |  |  |  |  |  |  | 17,850 |  |  | 17,850 |  |  |  |  |  |  |  |  |  |
Carlsbad Sub Lease [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable area | ft² |  |  |  |  | 4,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration date |  |  |  |  | Mar. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease commencement date |  |  |  |  | Oct. 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sublease agreement option to extend |  |  |  | In February 2024, Lineage extended the term of the sublease for 24 months through March 31, 2026 on similar terms. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rent for first twelve months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,000 |  |  |
Rent for remaining twelve months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,500 |  |  |
Carlsbad Sub Lease [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Security deposit |  |  | 22,500 |  |  |  |  |  |  |  | 22,500 |  |  | $ 22,500 |  |  |  |  |  |  |  |  |  |
CCN Leases [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,600 |  | 2,096 |  |  |  |  |
Lease expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |  |
Lessee operating lease renewal term description |  |  |  |  |  |  |  |  |  |  |  |  |  | options to extend the lease term for five years | options to extend the lease term for five years |  |  |  |  |  |  |  |  |
Base rent and construction allowance per month |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 | ₪ 165,000 |  |  |  |  |  |  |  |  |
Deposit assets |  |  | $ 514,000 |  |  |  |  |  |  |  | $ 514,000 |  |  | $ 514,000 |  |  |  |  |  |  |  |  |  |

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