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Commitments and Contingencies - Additional Information (Details)			1 Months Ended								3 Months Ended			9 Months Ended
	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