Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 05, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--12-31
Entity File Number	001-12830
Entity Registrant Name	Lineage Cell Therapeutics, Inc.
Entity Central Index Key	0000876343
Entity Tax Identification Number	94-3127919
Entity Incorporation, State or Country Code	CA
Entity Address, Address Line One	2173 Salk Avenue
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Carlsbad
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92008
City Area Code	(442)
Local Phone Number	287-8990
Title of 12(b) Security	Common stock
Trading Symbol	LCTX
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 93.9
Entity Common Stock, Shares Outstanding		161,637,890
ICFR Auditor Attestation Flag	false