2. Summary of significant accounting policies

The significant accounting policies and estimates used in preparation of the condensed consolidated financial statements are described in the Company’s audited consolidated financial statements as of and for the year ended December 31, 2022, and the notes thereto, which are included in the Company’s Annual Report on Form 10-K for the year ended  December 31, 2022, as filed with the Securities and Exchange Commission, or the SEC, on March 9, 2023. There have been no material changes in the Company’s significant accounting policies during the three and nine months ended September 30, 2023.

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of Aqua Metals, Inc. and subsidiaries (collectively, the “Company” or “Aqua Metals”) have been prepared in accordance with the interim reporting requirements of Form 10-Q, pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC”) and should be read in conjunction with the Company's audited consolidated financial statements for the period ended December 31, 2022, which are included on Form 10-K filed with the Securities and Exchange Commission on March 9, 2023. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles in the United States of America (“U.S. GAAP”) for annual consolidated financial statements. In the opinion of management, all adjustments (which include normal recurring adjustments) considered necessary to present fairly each of the condensed consolidated balance sheet as of September 30, 2023, the condensed consolidated statements of operations for the three and nine months ended September 30, 2023 and September 30, 2022, the condensed consolidated statements of stockholders' equity for the three and nine months ended September 30, 2023 and September 30, 2022 and the condensed consolidated statements of cash flows for the nine months ended September 30, 2023 and September 30, 2022, as applicable, have been made. The condensed consolidated balance sheet as of December 31, 2022 has been derived from the Company’s audited consolidated financial statements as of such date, but it does not include all disclosures required by U.S. GAAP for annual presentation.

The results of operations for the three and nine months ended September 30, 2023 are not necessarily indicative of results that may be expected for the year ending  December 31, 2023.

Principles of consolidation

The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries, all of which are wholly-owned subsidiaries. Inter-company accounts and transactions have been eliminated in consolidation.

Use of estimates

The preparation of the condensed consolidated financial statements requires management of the Company to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of expenses during the period. Significant items subject to such estimates and assumptions include the carrying amount and valuation of long-lived assets, valuation allowances for deferred tax assets, the determination of stock-based compensation expense and the determination of the fair value of stock warrants issued. Actual results could differ from those estimates.

Net loss per share

Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted average number of common share equivalents outstanding for the period determined using the treasury-stock method or the if-converted method, as applicable. For purposes of this calculation, stock options, restricted stock units (RSUs) and warrants to purchase common stock are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive. The following shares underlying outstanding convertible notes, stock options, RSUs and warrants to purchase common stock were anti-dilutive due to a net loss in the periods presented and, therefore, were excluded from the dilutive weighted average securities computation for the three and nine months ended September 30, as indicated below:

Segment and geographic information

Our chief operating decision maker (“CODM”) is the Chief Executive Officer. Operating segments are defined as components of an enterprise engaging in business activities for which discrete financial information is available and regularly reviewed by the CODM in deciding how to allocate resources and in assessing performance. The CODM views its operations and manages its business in one operating segment.

Concentration of credit risk

The Company did not generate significant revenue during the three and nine months ended September 30, 2023 and 2022, respectively, except for nominal revenue generated from the sale of lead finished goods. The Company had no trade receivables as of  December 31, 2022. The accounts receivable balance on the Company's consolidated balance sheet as of  December 31, 2022 consisted of proceeds from the sale of equipment. As of September 30, 2023 the Company had $25,000 in trade receivable and $51,000 in other receivables. The other receivables consisted of proceeds from a non-recurring engineering (NRE) arrangement with 6K Energy. 

Recent accounting pronouncements

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity, which is intended to simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity's own equity. The guidance allows for either full retrospective adoption or modified retrospective adoption. The guidance is effective for the Company in the first quarter of fiscal year 2024 and early adoption is permitted. The Company elected early adoption of ASU 2020-06 in the first quarter of its fiscal year 2023 on a modified retrospective basis. There was no material impact to the financial statements as a result of the adoption.