| Cover - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2022 | Apr. 26, 2023 | Jun. 30, 2022 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | This Amendment No. 1 on Form 10-K/A (this “Amendment”) amends the Annual Report on Form 10-K for the fiscal year ended December 31, 2022 of Lineage Cell Therapeutics, Inc. (the “Company”), as originally filed with the Securities and Exchange Commission (“SEC”) on March 9, 2023 (the “Original Form 10-K”). This Amendment is being filed to amend: (i) Part III of the Original Form 10-K to include the information required by Part III of Form 10-K that was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K because a definitive proxy statement containing such information may not be filed within 120 days after the end of the Company’s fiscal year ended December 31, 2022; and (ii) Part IV of the Original Form 10-K to add new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and in accordance with Rule 13a-14(a) under the Exchange Act. | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Dec. 31, 2022 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2022 | ||
| 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 | ||
| City Area Code | 287-8990 | ||
| Title of 12(b) Security | Common shares | ||
| Trading Symbol | LCTX | ||
| Security Exchange Name | NYSEAMER | ||
| 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 | $ 200.6 | ||
| Entity Common Stock, Shares Outstanding | 170,173,789 | ||
| Documents Incorporated by Reference | None | ||
| ICFR Auditor Attestation Flag | false | ||
| Auditor Firm ID | 100 | ||
| Auditor Name | WithumSmith+Brown, PC | ||
| Auditor Location | San Francisco, California |
