Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany accounts and transactions have been eliminated.

The significant accounting policies described below, together with Note 1 and other notes that follow, are an integral part of the condensed consolidated financial statements.

Unaudited Interim Condensed Consolidated Financial Statements

The condensed consolidated balance sheet as of December 31, 2023, which has been derived from our audited consolidated financial statements as filed in our Annual Report on Form 10-K with the Securities and Exchange Commission (the “SEC”) on March 28, 2024, and the unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and applicable rules and regulations of the SEC regarding interim financial reporting. Any reference in these notes to applicable accounting guidance is meant to refer to the authoritative U.S. GAAP included in the Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) issued by the Financial Accounting Standards Board (“FASB”). The condensed consolidated financial statements have been prepared on a basis consistent with the audited financial statements. In management’s opinion, all adjustments made were normal or recurring in nature and necessary for the fair statement of our financial position as of March 31, 2024 and our results of operations and cash flows during the three months ended March 31, 2024 and 2023. The financial data and other financial information disclosed in the notes to these condensed consolidated financial statements are also unaudited. The results of operations during the three months ended March 31, 2024 are not necessarily indicative of the results to be expected for the full fiscal year or any other period.

Certain information and note disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading.

Reclassification

Certain accounts in the prior period condensed consolidated statements of operations were reclassified to conform with the current period presentation. The reclassification had no impact on our prior period consolidated balance sheet, net loss and cash flows.

Emerging Growth Company

We are an emerging growth company as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and we may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies. Furthermore, the JOBS Act exempts an emerging growth company from being required to comply with new or revised accounting standards until private companies are required to comply with such standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. We have elected to not opt out of such extended transition period. This means that when a standard is issued or revised and it has different application dates for public or private companies, we, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt such new or revised standard unless we are no longer deemed an emerging growth company. As a result, the accompanying condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances; the results of which form the basis for making judgements that are not readily apparent from other sources. Actual results could materially differ from management estimates using different assumptions or under different conditions.

Our significant accounting estimates include useful lives of property, plant and equipment; valuation of deferred taxes; lower of cost or net realizable adjustment of inventory; incremental borrowing rate used in calculating lease obligations and right-of-use assets; and certain inputs used to measure fair value of stock option grants using the Black-Scholes option-pricing model.

Fair Value Measurements

We had money market funds totaling $22.2 million and $36.7 million as of March 31, 2024 and December 31, 2023, respectively, which were measured at Level 1 fair value based on the active market price of the instruments and included in cash and cash equivalents and in other assets in the accompanying condensed consolidated balance sheets.

We did not have assets or liabilities measured at fair value on a recurring basis using Level 2 or Level 3 inputs as of March 31, 2024 and December 31, 2023.

There were no transfers of financial instruments between Level 1, Level 2 and Level 3 during the three months ended March 31, 2024 and 2023.

Restricted Cash Equivalents

Restricted cash equivalents pertain to the amount of cash deposits required by our lessors to satisfy letters of credit requirements under our lease agreements. Restricted cash equivalents, which are included in other assets in the accompanying condensed consolidated balance sheets, were $1.3 million and $56 thousand as of March 31, 2024 and December 31, 2023, respectively.

Concentration of Credit Risk

Financial instruments that potentially subject us to concentration of credit risk include cash, cash equivalents, restricted cash equivalents and accounts receivable. Through March 31, 2024, we have not experienced losses on our financial assets held in financial institutions and on our accounts receivable.

As of March 31, 2024 and December 31, 2023, three customers represented 70% and 80%, respectively, of our total accounts receivable. During the three months ended March 31, 2024, three customers represented 22%, 20% and 13% of our revenue. During the three months ended March 31, 2023, three customers represented 34%, 23% and 19% of our revenue. Many of our customers are in the aviation industry though our batteries have applications across all segments of electric mobility. An adverse impact on the aviation industry may affect our relationship with our customers, which could affect our future financial condition, results of operations and cash flows.

Segment Reporting

We have determined that the Chief Executive Officer is our Chief Operating Decision Maker (“CODM”). The CODM reviews financial information presented on an aggregate basis for the purposes of assessing our performance and making decisions on how to allocate resources. Accordingly, we have determined that we operate in a single operating and reportable segment. All of our revenues are geographically earned in the United States and our property, plant and equipment are located in the United States.

Significant Accounting Policies

As of March 31, 2024, there have been no changes to our significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2023.

Recent Accounting Pronouncements Not Yet Adopted

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU requires entities to disclose, among others, (i) specific categories in the rate reconciliation table (ii) additional information for reconciling items that meet a quantitative threshold and (iii) the amount of income taxes paid on a disaggregated level. This ASU is required to be adopted on a prospective basis. As an emerging growth company, this ASU is effective starting on our annual reporting for the year ending December 31, 2026. Early adoption is permitted. We are currently evaluating this ASU. We believe that the impact of the additional required disclosures will enhance our current financial statement disclosure.

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU requires entities to disclose, among others, (i) significant segment expenses that are regularly provided to the CODM for measuring segment profit or loss, (ii) amounts for other significant items by reportable segment and (iii) an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding resource allocation. This ASU is required to be adopted on a retrospective basis starting

on our annual reporting for the year ending December 31, 2024. Early adoption is permitted. We are currently evaluating this ASU. We believe that the impact of the additional required disclosures will enhance our financial statement disclosure.