| Cover | Sep. 27, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | LIGHTBRIDGE CORPORATION |
| Entity Central Index Key | 0001084554 |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Emerging Growth Company | false |
| Document Period End Date | Sep. 27, 2021 |
| Entity File Number | 001-34487 |
| Entity Incorporation State Country Code | NV |
| Entity Tax Identification Number | 91-1975651 |
| Entity Address Address Line 1 | 11710 Plaza America Drive |
| Entity Address Address Line 2 | Suite 2000 |
| Entity Address City Or Town | Reston |
| Entity Address State Or Province | VA |
| Entity Address Postal Zip Code | 20190 |
| City Area Code | 571 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Local Phone Number | 730-1200 |
| Security 12b Title | Common Stock, $0.001 par value |
| Trading Symbol | LTBR |
| Security Exchange Name | NASDAQ |
