v3.26.1
Cover - shares
3 Months Ended
Mar. 31, 2026
Apr. 30, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
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 Common stock, par value $0.001 per share  
Trading Symbol ACVA  
Security Exchange Name NYSE  
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 Common Stock, Shares Outstanding   174,584,894
Entity Central Index Key 0001637873  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1