Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 10, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2022
Entity File Number	001-38935
Entity Registrant Name	ATRECA, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-3723255
Entity Address, Address Line One	835 Industrial Road, 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
Title of 12(b) Security	Class A Common Stock
Trading Symbol	BCEL
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Central Index Key	0001532346
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		32,351,950
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,715,441