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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock Class A
Common Stock
Common Stock Class A
Common Stock
Common Stock Class B
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2023 $ 456,528   $ 139 $ 23 $ 880,510 $ (422,615) $ (1,529)
Balance (in shares) at Dec. 31, 2023     138,637 23,205      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of Class B common stock to Class A common stock 0   $ 15 $ (15)      
Conversion of Class B common stock to Class A common stocks (in shares)     14,710 (14,710)      
Net loss (53,563)         (53,563)  
Other comprehensive income (loss) 1,360           1,360
Stock-based compensation 52,117       52,117    
Exercise of common stock options 8,644   $ 2 $ 1 8,641    
Exercise of common stock options (in shares)     1,441 631      
Vested restricted stock units (19,428)   $ 1   (19,429)    
Vested restricted stock units (in shares)     1,377 199      
Issuance of shares for acquisitions 8,556   $ 1   8,555    
Issuance of shares for acquisitions (in shares)     1,413        
Issuance of shares for employee stock purchase plan 1,998       1,998    
Issuance of shares for employee stock purchase plan (in shares)   142          
Balance at Sep. 30, 2024 456,212   $ 158 $ 9 932,392 (476,178) (169)
Balance (in shares) at Sep. 30, 2024     157,721 9,325      
Balance at Jun. 30, 2024 457,617   $ 152 $ 14 919,216 (460,149) (1,616)
Balance (in shares) at Jun. 30, 2024     151,659 14,370      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of Class B common stock to Class A common stock 0   $ 5 $ (5)      
Conversion of Class B common stock to Class A common stocks (in shares)     5,107 (5,107)      
Net loss (16,029)         (16,029)  
Other comprehensive income (loss) 1,447           1,447
Stock-based compensation 17,772       17,772    
Exercise of common stock options 1,831   $ 1   1,830    
Exercise of common stock options (in shares)     515        
Vested restricted stock units (6,426)       (6,426)    
Vested restricted stock units (in shares)     439 62      
Balance at Sep. 30, 2024 456,212   $ 158 $ 9 932,392 (476,178) (169)
Balance (in shares) at Sep. 30, 2024     157,721 9,325      
Balance at Dec. 31, 2024 440,004   $ 168 [1]   944,891 (502,315) (2,740)
Balance (in shares) at Dec. 31, 2024 [1]     168,029        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (46,580)         (46,580)  
Other comprehensive income (loss) 4,124           4,124
Stock-based compensation 57,098       57,098    
Exercise of common stock options $ 760   $ 2 [1]   758    
Exercise of common stock options (in shares) 2,003   2,003 [1]        
Vested restricted stock units $ (23,490)   $ 2 [1]   (23,492)    
Vested restricted stock units (in shares) [1]     1,961        
Issuance of shares for employee stock purchase plan 2,534       2,534    
Issuance of shares for employee stock purchase plan (in shares) [1]   178          
Balance at Sep. 30, 2025 434,450   $ 172 [1]   981,789 (548,895) 1,384
Balance (in shares) at Sep. 30, 2025 [1]     172,171        
Balance at Jun. 30, 2025 448,783   $ 172 [1]   971,390 (524,430) 1,651
Balance (in shares) at Jun. 30, 2025 [1]     171,559        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (24,465)         (24,465)  
Other comprehensive income (loss) (267)           (267)
Stock-based compensation 16,024       16,024    
Exercise of common stock options 229   $ 0 [1]   229    
Exercise of common stock options (in shares) [1]     99        
Vested restricted stock units (5,854)   $ 0 [1]   (5,854)    
Vested restricted stock units (in shares) [1]     513        
Issuance of shares for employee stock purchase plan 0       0    
Balance at Sep. 30, 2025 $ 434,450   $ 172 [1]   $ 981,789 $ (548,895) $ 1,384
Balance (in shares) at Sep. 30, 2025 [1]     172,171        
[1] Following the approval by the Company's shareholders of certain amendments to the Company's Certificate of Incorporation at the 2025 Annual Shareholder Meeting, the Company filed with the State of Delaware the Eleventh Amended and Restated Certificate of Incorporation of ACV Auctions Inc. The changes include, among other things, the removal of all references to Class B Common Stock and the reclassification of Class A Common Stock to Common Stock.