Cover - shares	6 Months Ended
	Jun. 30, 2024	Jul. 31, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
Entity File Number	001-40256
Entity Registrant Name	ACV Auctions Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-2415221
Entity Address, Address Line One	640 Ellicott Street, #321
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14203
City Area Code	800
Local Phone Number	553-4070
Title of 12(b) Security	Class A common stock, par value $0.001 per share
Trading Symbol	ACVA
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001637873
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Common Stock Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		152,175,941
Common Stock Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		14,410,553