| Document and Entity Information | Aug. 10, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 10, 2021 |
| Entity Registrant Name | Talis Biomedical Corporation |
| Entity Central Index Key | 0001584751 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity File Number | 001-40047 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 46-3122255 |
| Entity Address, Address Line One | 230 Constitution Drive |
| Entity Address, City or Town | Menlo Park |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94025 |
| 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 |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | TLIS |
| Security Exchange Name | NASDAQ |
