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Summary of Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Basis of Presentation | Basis of Presentation The condensed consolidated financial statements include the accounts of Larimar and its wholly owned subsidiary. All intercompany balances and transactions have been eliminated. The accompanying condensed consolidated financial statements have been prepared in conformity with U.S. Generally Accepted Accounting Principles (“GAAP”). The consolidated balance sheet as of December 31, 2024 was derived from the Company’s audited financial statements but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements as of September 30, 2025 and for the three and nine months ended September 30, 2025 and 2024, have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2024 included in the Company’s Annual Report on Form 10-K filed with the SEC on March 24, 2025. In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s condensed consolidated financial position as of September 30, 2025, condensed consolidated results of operations for the three and nine months ended September 30, 2025 and condensed consolidated statement of cash flows for the nine months ended September 30, 2025 have been made. The results of operations for the three and nine months ended September 30, 2025 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2025.
Going Concern Assessment | Liquidity and Capital Resources The Company’s condensed consolidated financial statements have been presented on the basis that it will continue as a going concern, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. Since its inception, the Company has incurred significant recurring operating losses and negative cash flows from operations. The Company has incurred net losses of $103.2 million and $51.8 million for the nine months ended September 30, 2025 and 2024, respectively. In addition, as of September 30, 2025, the Company had an accumulated deficit of $372.3 million. The Company expects to continue to generate operating losses for the foreseeable future. As of September 30, 2025, the Company had approximately $175.4 million of cash, cash equivalents and marketable securities available for use to fund its operations and capital requirements. The Company has funded its operations to date primarily with proceeds from sales of common stock and proceeds from the sale of prefunded warrants for the purchase of common stock, the acquisition in 2020 of cash, cash equivalents and marketable securities upon the merger with Zafgen, Inc. (“Zafgen”) and, prior to the 2020 merger with Zafgen, capital contributions from Chondrial Holdings, LLC. On July 31, 2025, the Company completed an underwritten public offering of common stock raising net proceeds of approximately $65.0 million. In accordance with Accounting Standards Update (“ASU”) No. 2014-15, “Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern”, the Company has evaluated whether there are certain conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that these condensed consolidated financial statements are issued. As of the issuance date of these condensed consolidated financial statements, the Company expects its cash, cash equivalents and marketable securities will be sufficient to fund its forecasted operating expenses and capital expenditure requirements for at least twelve months from the date these financial statements are issued, into the fourth quarter of 2026. If the timing of the Company's clinical assumptions are delayed or if there are other forecasted assumption changes that negatively impact its operating plan, the Company would reduce commercial and other expenditures in order to further extend cash resources. The Company continually evaluates various financing alternatives further as discussed below. If the Company is unable to raise sufficient additional funding prior to the issuance of its 2025 financial statements for the fiscal year ending December 31, 2025, the Company may conclude there is substantial doubt about our ability to continue as a going concern for the twelve months following the filing of its annual report on 2025 Form 10K for the fiscal year ending December 31, 2025. The Company has not yet commercialized any products and does not expect to generate revenue from the commercial sale of any products for several years, if at all. The Company expects that its research and development and general and administrative expenses will continue to increase and, as a result, that it will need additional capital to fund its future operating and capital requirements. Unless and until the Company can generate substantial revenue, management continuously evaluates different strategies to obtain the required funding for future operations. These strategies include seeking additional funding through a combination of public or private equity offerings, debt or royalty financings, collaborations and licensing arrangements, strategic partnerships with pharmaceutical and/or larger biotechnology companies, or other sources. The incurrence of indebtedness would result in increased fixed payment obligations and the Company may be required to agree to certain restrictive covenants, such as limitations on its ability to incur additional debt, limitations on its ability to acquire, sell or license intellectual property rights, minimum required cash balances and other operating restrictions that could adversely impact the Company's ability to conduct its business. Any additional fundraising efforts may divert the Company's management from their day-to-day activities, which may adversely affect its ability to develop and commercialize its product candidates. There can be no assurance that the Company will be able to raise sufficient additional capital on acceptable terms, if at all. If such additional financing is not available on satisfactory terms, or is not available in sufficient amounts, or if the Company does not have sufficient authorized shares, the Company may be required to delay, limit, or eliminate the development of business opportunities and its ability to achieve its business objectives, its competitiveness, and its business, financial condition, and results of operations will be materially adversely affected. The Company could also be required to seek funds through arrangements with collaborative partners or otherwise at an earlier stage than otherwise would be desirable and it may be required to relinquish rights to some of its technologies or product candidates or otherwise agree to terms unfavorable to it, any of which may have a material adverse effect on the Company's business, operating results and prospects.
Use of Estimates | Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. This process involves reviewing open contracts and purchase orders, communicating with our personnel and outside vendors to identify services that have been performed on our behalf and estimating the level of service performed and the associated costs incurred for the services when we have not yet been invoiced or otherwise notified of the actual costs. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the accrual of research and development expense, the recording as prepaid expense of payments made in advance of the actual provision of goods or services, valuation of stock-based awards and valuation of leases. Due to inherent uncertainty involved in making estimates, actual results reported in future periods may be affected by changes in these estimates. On an ongoing basis, the Company evaluates its estimates and assumptions.
Research and Development Costs | Research and Development Costs Costs associated with internal research and development and external research and development services, including drug development, clinical studies and non-clinical studies, are expensed as incurred. Research and development expenses include costs for salaries, employee benefits, subcontractors, facility-related expenses, depreciation, stock-based compensation, third-party license fees, laboratory supplies, and external costs of outside vendors engaged to conduct discovery, non-clinical and clinical development activities and clinical trials as well as to manufacture clinical trial materials, and other costs. The Company recognizes external research and development costs based on an evaluation of the progress to completion of specific tasks using information provided to the Company by its key service providers. Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. Such prepaid expenses are recognized as an expense when the goods have been delivered or the related services have been performed, or when it is no longer expected that the goods will be delivered, or the services rendered. Upfront payments, milestone payments and annual maintenance fees under license agreements are currently expensed in the period in which they are incurred.
Patent Costs | Patent Costs All patent-related costs incurred in connection with filing and prosecuting patent applications are expensed as incurred due to the uncertainty about the recovery of the expenditure. Amounts incurred are classified as general and administrative expenses.
Stock-Based Compensation | Stock-Based Compensation The Company measures all stock-based awards granted to employees and directors based on the fair value on the date of grant using the Black-Scholes option-pricing model. Compensation expense of those awards is recognized over the requisite service period, which is the vesting period of the respective award. Typically, the Company issues awards with only service-based vesting conditions and records the expense for these awards using the straight-line method. The Company accounts for forfeitures as they occur. The Company classifies stock-based compensation expense in its consolidated statements of operations and comprehensive loss in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified. Prior to May 28, 2020, the Company had been a private company and lacked company-specific historical and implied volatility information for its common stock. Prior to January 1, 2023, the Company estimated its expected common stock price volatility solely based on the historical volatility of publicly traded peer companies. Beginning on January 1, 2023, based on the availability of sufficient historical trading data of the Company's own common stock on the Nasdaq Global Market to calculate accurately its volatility, the Company began blending its volatility starting from June 2020 (following its merger with Zafgen in 2020) to the date of each stock-based award, and weighing the volatility of its peer group for the amount of time from May 31, 2020 backwards so that the blended volatility equals the expected term of the related stock-based award. The expected term of the Company’s stock options has been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. The expected dividend yield considers the fact that the Company has never paid cash dividends on common stock and does not expect to pay any cash dividends in the foreseeable future.
Net Loss Per Share | Net Loss Per Share Basic net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted net loss per share attributable to common stockholders is computed by dividing the diluted net loss attributable to common stockholders by the weighted average number of common shares, including potentially dilutive common stock equivalents assuming the dilutive effect of outstanding stock options, outstanding restricted stock units, and unvested restricted common shares, as determined using the treasury stock method. For periods in which the Company has reported net losses (all periods since inception), diluted net loss per common share attributable to common stockholders is the same as basic net loss per common share attributable to common stockholders, since dilutive common stock equivalents are not assumed to have been issued if their effect is antidilutive. The Company excluded 9,618,132 and 6,990,827 common stock equivalents outstanding as of September 30, 2025 and 2024, respectively, from the computation of diluted net loss per share for the three and nine months ended September 30, 2025 and 2024 because they had an anti-dilutive impact due to the net loss incurred for the periods presented.
Segment Information | Segment Information Operating segments are defined as components of an enterprise for which separate discrete information is available for evaluation by the chief operating decision maker, or decision making group, in deciding how to allocate resources in assessing performance. The Company is managed on a consolidated basis and has one operating and reportable segment related to the development of clinical and preclinical product candidates for the development of the Company’s proprietary new therapies, primarily nomlabofusp, the Company's life science segment. The Company’s chief operating decision maker (“COPM”) is the Company's chief executive officer (“CEO”). The accounting policies of the life science segment are the same as those described in the summary of significant accounting policies. The CODM assesses performance for the Company and its reportable segment based on net loss, which is reported on the consolidated Statements of Operations. The measure of segment assets is reported on the balance sheet as total consolidated assets. All long-lived assets are located in the U.S. To date, the Company has not generated any product revenue. The Company expects to continue to incur significant expenses and operating losses for the foreseeable future as it advances product candidates through all stages of development and clinical trials and regulatory approval. The CODM uses consolidated financial information, including consolidated net loss, to evaluate performance, forecast future period financial results, allocate resources for the company by, among other things, comparing budgeted to actual results. The table below summarizes the significant expense categories regularly provided to the CODM for the three and nine months ended September 30, 2025 and 2024:
|  | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  | 2025 |  |  | 2024 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Technical operations |  | $ | 33,850 |  |  | $ | 6,552 |  | $ | 62,800 |  |  | $ | 26,022 |
Development (a)(b) |  |  | 9,653 |  |  |  | 5,999 |  |  | 27,757 |  |  |  | 16,620 |
Nomlabofusp support |  |  | 1,428 |  |  |  | 1,368 |  |  | 4,294 |  |  |  | 3,898 |
General and administrative (c)(d) |  |  | 3,780 |  |  |  | 3,739 |  |  | 11,569 |  |  |  | 12,018 |
Commercial (e) |  |  | 788 |  |  |  | 606 |  |  | 2,059 |  |  |  | 1,039 |
Total operating expenses |  | $ | 49,499 |  |  | $ | 18,264 |  | $ | 108,479 |  |  | $ | 59,597 |
Other income, net |  |  | (1,787 | ) |  |  | (2,765 | ) |  | (5,304 | ) |  |  | (7,817 | )
Net loss |  | $ | (47,712 | ) |  | $ | (15,499 | ) | $ | (103,175 | ) |  | $ | (51,780 | )
(a) Development expenses include research and development related stock compensation expense of approximately $0.9 million and $0.9 million for the three months ended September 30, 2025 and 2024, respectively. (b) Development expenses include research and development related stock compensation expense of approximately $2.7 million and $2.8 million for the nine months ended September 30, 2025 and 2024, respectively. (c) General and administrative expenses include general and administrative related stock compensation expense of approximately $0.9 million and $1.0 million for the three months ended September 30, 2025 and 2024, respectively. (d) General and administrative expenses include general and administrative related stock compensation expense of approximately $2.7 million and $3.6 million for the nine months ended September 30, 2025 and 2024, respectively. (e) Commercial expenses relate to commercial readiness activities.
Recently Issued and Adopted Accounting Pronouncements | Recently Issued and Adopted Accounting Pronouncements From time to time, new accounting guidance is issued by the FASB or other standard setting bodies that is adopted by us as of the effective date or, in some cases where early adoption is permitted, in advance of the effective date. We have assessed the recently issued guidance that is not yet effective and believe the new guidance will not have a material impact on the condensed consolidated results of operations, cash flows or financial position. Recently Issued Accounting Pronouncements Not Yet Adopted In December 2023, the FASB issued ASU No. 2023-09, “Improvements to Income Tax Disclosures (Topic 740),” which requires entities to disclose in their rate reconciliation table additional categories of information about federal, state and foreign income taxes as well as additional information about reconciling items if certain quantitative thresholds are met. This ASU will require all entities to disclose income taxes paid, net of refunds, disaggregated by federal (national), state and foreign taxes for annual periods and to disaggregate the information by jurisdiction based on a quantitative threshold. All entities are required to apply the guidance prospectively, with the option to apply it retrospectively. The ASU is effective for fiscal years beginning after December 15, 2024, with early adoption permitted. The Company will adopt ASU-203-09 beginning with our annual reporting period ending December 31, 2025. The Company is currently evaluating the impact that this standard may have on its year-end financial statements. In November 2024, the FASB issued ASU 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses”, which requires disaggregated disclosures in the notes of the financial statements of certain categories of expenses that are included in expense line items on the face of the income statement. This ASU is effective for annual periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company will evaluate the impact adopting ASU 2024-03 will have on the Company's consolidated financial statements and disclosures.
Income Taxes | Income Taxes We recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax basis of assets and liabilities, as well as for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using the tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. We record valuation allowances to reduce deferred tax assets to the amount we believe is more likely than not to be realized. During the three and nine months ended September 30, 2025 and 2024, the Company recorded no income tax benefits for the net operating losses incurred in each period due to the uncertainty of realizing a benefit from those items. On July 4, 2025, Public Law 119-21 (“The Law”) became effective. The Law includes significant provisions, such as the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act, modifications to the international tax framework and the restoration of favorable tax treatment for certain business provisions. The legislation has multiple effective dates, with certain provisions effective in 2025 and others implemented through 2027. The Law did not have a material impact on its estimated annual effective tax rate or cash flows in 2025.

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