| Cover | Aug. 12, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 12, 2021 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock |
| Trading Symbol | LCTX |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
