| Document And Entity Information | Mar. 22, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 22, 2023 |
| Entity Registrant Name | Talis Biomedical Corp |
| Entity Central Index Key | 0001584751 |
| Entity Emerging Growth Company | true |
| Securities Act File Number | 001-40047 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 46-3122255 |
| Entity Address, Address Line One | 3400 Bridge Parkway |
| Entity Address, City or Town | Redwood City |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94065 |
| City Area Code | (650) |
| Local Phone Number | 433-3000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | TLIS |
| Security Exchange Name | NASDAQ |
