| Cover | Oct. 18, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 18, 2021 |
| Entity File Number | 001-38935 |
| Entity Registrant Name | Atreca, Inc. |
| Entity Central Index Key | 0001532346 |
| Entity Tax Identification Number | 27-3723255 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 835 Industrial Rd., Suite 400 |
| Entity Address, City or Town | San Carlos |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94070 |
| City Area Code | 650 |
| Local Phone Number | 595-2595 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, $0.0001 par value per share |
| Trading Symbol | BCEL |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
