| Document and Entity Information | Apr. 03, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 03, 2024 |
| Entity Registrant Name | KINNATE BIOPHARMA INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39743 |
| Entity Tax Identification Number | 82-4566526 |
| City Area Code | 858 |
| Local Phone Number | 299-4699 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.0001 per share |
| Trading Symbol | KNTE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Current Fiscal Year End Date | --12-31 |
| Entity Address State Or Province | CA |
| Entity Address Postal Zip Code | 00000 |
| Amendment Flag | false |
| Entity Central Index Key | 0001797768 |
