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Net Loss Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The numerators and denominators of the basic and diluted net loss per share computations for the Company's common stock are calculated as follows for the three and nine months ended September 30, 2025 and 2024 (in thousands, except per share data):
| Three months ended September 30, |  | Nine months ended September 30,
| 2025 |  |  |  | 2024 |  | 2025 |  |  |  | 2024
| Common Stock (1) |  |  |  | Class A |  | Class B |  | Common Stock (1) |  |  |  | Class A |  | Class B
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders | $ | (24,465) |  |  |  |  | $ | (14,734) |  |  | $ | (1,295) |  |  | $ | (46,580) |  |  |  |  | $ | (47,932) |  |  | $ | (5,631) |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of shares of common stock - basic and diluted | 171,348 |  |  |  | 152,334 |  | 13,389 |  | 170,067 |  |  |  | 147,061 |  | 17,276
Net loss per share attributable to common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ | (0.14) |  |  |  |  | $ | (0.10) |  |  | $ | (0.10) |  |  | $ | (0.27) |  |  |  |  | $ | (0.33) |  |  | $ | (0.33) |
(1) During the fourth quarter of 2024, the number of outstanding shares of the Company's Class B common stock declined such that the total number of outstanding shares of Class B common stock represented less than 5% of the aggregate number of outstanding shares of the Company's Class A common stock and Class B common stock. Under the terms of the Company's amended and restated certificate of incorporation, the Company's Class B common stock automatically converted to Class A common stock effective as of December 31, 2024. This resulted in 3,550,142 shares of Class A common stock being issued on December 31, 2024 with the related shares of Class B common stock being cancelled. 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.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following table presents the total weighted-average number of potentially dilutive shares that were excluded from the computation of diluted net loss per share attributable to common shareholders because their effect would have been anti-dilutive for the period presented:
| Three months ended September 30, |  | Nine months ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Unvested RSUs and other awards | 1,353 |  | 3,348 |  | 2,379 |  | 3,235
Stock options | 1,499 |  | 4,049 |  | 2,070 |  | 4,497

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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