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Accounting Policies, by Policy (Policies)
 9 Months Ended
Sep. 30, 2025
Summary of Significant Accounting Policies [Abstract]  
Basis of Presentation

Basis of Presentation

The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the applicable rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). The accompanying condensed consolidated financial statements include all of the accounts of the Company and its subsidiaries, Abpro Corporation and AbMed Corporation (“AbMed”). All intercompany balances and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation with no material impact on the condensed consolidated financial statements.
Use of Estimates

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and judgments that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Significant estimates in these condensed consolidated financial statements include stock-based compensation expense, the fair value of derivative instruments, the fair value of options and warrants, pre-clinical and clinical accrued expenses, the valuation and realizability of deferred tax assets, and the ability to continue as a going concern. On an ongoing basis, the Company evaluates its estimates, judgments, and methodologies. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable. Due to the inherent uncertainty involved in making estimates, actual results could differ materially from those estimates.

In March 2022, the Company received an invoice from Mabwell (Shanghai) Bioscience Co., Ltd. (“Mabwell”) for approximately $3,500 in connection with the manufacturing of certain clinical material for the Company. The Company recorded the estimated amount in accounts payable based on the information available at the time, and subsequently engaged in discussion with Mabwell about the invoiced amount and its validity. The Company continued to dispute the amount and its contractual basis because the parties had neither finalized nor executed a clinical trial manufacturing agreement. In July 2024, the Company received communication from Mabwell that they will not be pursuing the collection of the originally invoiced amount. Accordingly, during the quarter ended March 31, 2024, the Company reversed the liability and recognized $3,500 of other income.
Unaudited Interim Condensed Consolidated Financial Statements

Unaudited Interim Condensed Consolidated Financial Statements

The accompanying interim condensed consolidated financial statements and the related footnote disclosures are unaudited. These unaudited interim financial statements have been prepared on the same basis as the audited financial statements, and in management’s opinion, include all adjustments, consisting of only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of September 30, 2025 and its results of operations for the three months and nine months ended September 30, 2025 and 2024, and cash flows for the nine months ended September 30, 2025 and 2024. The results of operations for the three months and nine months ended September 30, 2025 are not necessarily indicative of the results to be expected for the year ended December 31, 2025 or any other period. The December 31, 2024 year-end condensed consolidated balance sheet was derived from audited annual financial statements but does not include all disclosures from the annual financial statements.

Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. Accordingly, these condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2024 and the related notes included in the Company’s Annual Report on Form 10-K, filed with the SEC on April 15, 2025 (the “Annual Report”), which provides a more complete discussion of the Company’s accounting policies and certain other information. There have been no significant changes to the significant accounting policies disclosed in Note 2 of the audited consolidated financial statements as of and for the year ended December 31, 2024 included in the Company’s Annual Report.
Segment Reporting

Segment Reporting

ASC Topic No. 280, Segment Reporting (“ASC 280”), establishes standards for the way that public business enterprises report information about operating segments in their annual consolidated financial statements and requires that those enterprises report selected information about operating segments in interim financial reports. ASC 280 also establishes standards for related disclosures about products and services, geographic areas and major customers. The Company’s business segments are based on the organization structure used by the chief operating decision maker (“CODM”) for making operating and investment decisions and for assessing performance.

In accordance with ASC 280, the Company has determined that it operates as a single reportable segment, which is the business of development of novel antibodies, primarily in the areas of immuno-oncology, ophthalmology and infectious disease. The financial results of the Company’s operations are managed and reported to the Chief Executive Officer, who is considered the Company’s CODM, on a consolidated basis. The CODM assesses performance and allocates resources based on the Company’s consolidated statements of operations, and key components and processes of the Company’s operations are managed centrally. Segment asset information is not used by the CODM to allocate resources. The Chief Executive Officer uses operating losses and cash flows from operating activities to evaluate performance of the operating segment assets in deciding how to allocate the cash resources. Significant expenses presented to the CODM include research and development expenses, general and administrative expenses, and interest expenses, which are each separately presented on the Company’s condensed consolidated statements of operations.
Non-controlling Interest

Non-controlling Interest

The Company holds an 82% ownership interest in its consolidated subsidiary, AbMed. Non-controlling interest represents the portion of net book value in AbMed that is not owned by the Company and is reported as a component in stockholders’ equity on the condensed consolidated balance sheets. The Company bears all the operating costs of AbMed. Upon an event of default by the Company or upon a liquidation of AbMed, the non-controlling interest holder has the right to put its interest in AbMed to the Company. The amount to be paid under the redemption option is equal to $2.00 per share for each preferred share of AbMed stock held by the non-controlling interest holder plus all accrued and unpaid dividends thereon. The Company has not allocated any losses to the noncontrolling interests given that the preferred shares held by the non-controlling interest holder have no contractual obligations to share in the losses of AbMed. There were no operating activities in AbMed during the nine month periods ending September 30, 2025 and 2024. 
Net Loss Per Share

Net Loss Per Share

The Company follows the two-class method to compute basic and diluted net loss per share attributable to common stockholders when shares meet the definition of participating securities. Series A, Series B, Series C, Series D, Series E and Series F preferred stock (see Note 12), which were outstanding prior to the Closing Date, met the definition of participating securities. The two-class method determines net income (loss) per common share for each class of common and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The two-class method requires income available to common stockholders for the period to be allocated between common and participating securities based upon their respective rights to share in the earnings as if all income for the period had been distributed. During periods of loss, there is no allocation required under the two-class method due to there being no distributed earnings for the period coupled with the fact that the Company’s Series A, Series B, Series C, Series D, Series E and Series F preferred stock do not contain a contractual right to absorb losses. Thus, all undistributed losses were allocated entirely to the Company’s outstanding common stock for all periods presented.

Basic net loss per share attributable to common stockholders is computed by dividing net loss attributable to common stockholders by the weighted-average number of common stock outstanding during the period without consideration of potentially dilutive common stock. Diluted net loss per share attributable to common stockholders reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company unless the inclusion of such shares would be anti-dilutive. As the Company has incurred losses for the three and nine months ended September 30, 2025 and 2024, basic and diluted net loss per share were the same all periods presented.

The following table presents the potentially dilutive shares that were excluded from the computation of diluted net loss per share, because their effect was anti-dilutive:

   September 30, 
   2025   2024 
Convertible Preferred Stock   
-
    662,921 
Warrants   990,000    4,159 
Stock options   222,635    345,164 
Unvested restricted stock units   16,667    1,292 
Total   1,229,302    1,013,536 
Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” that addresses requests for improved income tax disclosures from investors that use the financial statements to make capital allocation decisions. Public entities must adopt the new guidance for fiscal years beginning after December 15, 2024. The amendments in this ASU must be applied on a retrospective basis to all prior periods presented in the financial statements and early adoption is permitted. The Company adopted this standard on January 1, 2025 and determined that the adoption does not have a material impact on these unaudited condensed consolidated financial statements.
Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

On November 4, 2024, the FASB issued ASU 2024-03, Accounting Standards Update 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses to improve financial reporting by requiring that public business entities disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. The amendments in this ASU do not change or remove current expense disclosure requirements; however, the amendments affect where such information appears in the notes to financial statements because entities are required to include certain current disclosures in the same tabular format disclosure as the other disaggregation requirements in the amendments. This ASU is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating the potential impact that the adoption of this standard will have on its financial statements.

Management does not believe that any additional recently issued, but not yet effective, accounting standards, if currently adopted, would have a material impact on the Company’s financial statements.