Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]
Business Combination	Business Combination On August 12, 2021, the Company consummated a merger pursuant to certain Agreement and Plan of Merger, dated October 7, 2020, and as amended on March 5, 2021, April 6, 2021, and June 29, 2021 (the “Merger Agreement”), by and among Stable Road Acquisition Corp (“SRAC”), Project Marvel First Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of SRAC (“First Merger Sub”), and Project Marvel Second Merger Sub, LLC, a Delaware limited liability company and a direct, wholly owned subsidiary of SRAC (“Second Merger Sub”), pursuant to which First Merger Sub merged with and into Momentus Inc., a Delaware corporation (“Legacy Momentus”) with Legacy Momentus as the surviving corporation of the First Merger Sub, and immediately following which Legacy Momentus merged with and into the Second Merger Sub, with the Second Merger Sub as the surviving entity (the “Business Combination”). In connection with the closing of the Business Combination (the “Closing”), the Company changed its name from Stable Road Acquisition Corp. to Momentus Inc., and Legacy Momentus changed its name to Momentus Space, LLC. The Merger was accounted for as a reverse recapitalization under ASC Topic 805, Business Combinations ("ASC 805") in accordance with accounting principles generally accepted in the United States (“GAAP”). Under this method of accounting, SRAC, who was the legal acquirer, is treated as the “acquired” company for financial reporting purposes and Legacy Momentus is treated as the accounting acquirer. Accordingly, for accounting purposes, the Merger is treated as the equivalent of a capital transaction in which Legacy Momentus issued stock for the net assets of SRAC, with no goodwill or other intangible assets recorded, and Legacy Momentus’ financial statements became those of the Company. Reported shares and earnings per share available to holders of the Company’s common stock, prior to the Business Combination, have been retroactively restated as shares reflecting the exchange ratio established in the Business Combination. See Note 3 for more information.
Unaudited Interim Financial Information and Basis of Presentation	The accompanying interim unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and pursuant to the rules and regulations of the Securities and Exchange Commission. 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. The balance sheet as of December 31, 2020 was derived from the Company’s audited financial statements but does not include all disclosures required by GAAP for audited financial statements. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited financial statements. In the opinion of the Company’s management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments that are necessary to present fairly the Company’s financial position as of September 30, 2021 and December 31, 2020, the net income (loss) for the three and nine months ended September 30, 2021 and 2020, the stockholders’ equity (deficit) for the three and nine months ended September 30, 2021 and 2020, and cash flows for the nine months ended September 30, 2021 and 2020. Such adjustments are of a normal and recurring nature. The results for the three and nine months ended September 30, 2021 are not necessarily indicative of the results for the year ending December 31, 2021, or for any future period. These interim condensed consolidated financial statements should be read in conjunction with the audited financial statements as of and for the years ended December 31, 2020 and 2019, filed with the Securities and Exchange Commission (the “SEC”) in SRAC’s proxy statement on July 21, 2021. The Business Combination was accounted for as a reverse recapitalization in accordance with U.S. GAAP. Under this method of accounting, SRAC is treated as the acquired company and Momentus Inc. is treated as the acquirer for financial statement reporting purposes (the “Combined Company”). Momentus Inc. was determined to be the accounting acquirer as Momentus Inc.'s shareholders prior to the Merger had the greatest voting interest in the combined entity, Momentus Inc. comprises all of the ongoing operations, and Momentus Inc.'s senior management directs operations of the combined entity. Accordingly, for accounting purposes, the financial statements of the Combined Company represent a continuation of the financial statements of Momentus with the acquisition being treated as the equivalent of Momentus issuing stock for the net assets of SRAC, accompanied by a recapitalization. The net assets of SRAC are recorded at historical cost, with no goodwill or other intangible assets recorded. One-time direct and incremental transaction costs incurred by the Company were recorded based on the activities to which the costs relate and the structure of the transaction; cost allocated to the issuance of equity were recorded as a reduction of the amount of equity raised, presented in additional paid in capital, while all costs allocated to the liability classified warrants were charged to expense. In connection with the Business Combination, outstanding units of Momentus were converted into common stock of the Company, par value $0.00001 per share, representing a recapitalization. Momentus is deemed to be the predecessor of the Company, and the consolidated assets and liabilities and results of operations prior to the Closing Date are those of Momentus. The shares and corresponding capital amounts and net income (loss) per share available to common stockholders, prior to the Business Combination, have been retroactively restated as shares reflecting the exchange ratio established in the Business Combination Agreement.
Reclassifications	Certain reclassifications have been made to the prior year’s financial statements to conform to the current year’s presentation. None of the reclassifications have changed the total assets, liabilities, stockholders’ deficit, income, expenses or net losses previously reported.
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Accordingly, actual results could differ from those estimates. Significant estimates inherent in the preparation of the financial statements include, but are not limited to, accounting for useful lives of property, machinery and equipment, net, intangible assets, net, accrued liabilities, income taxes including deferred tax assets and liabilities, impairment valuation, stock-based awards, SAFE notes and warrant liabilities.
Emerging Growth Company Status	Section 102(b)(1) of the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”) exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can choose not to take advantage of the extended transition period and comply with the requirements that apply to non-emerging growth companies, and any such election to not take advantage of the extended transition period is irrevocable. The Company is an “emerging growth company” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”) and has elected to take advantage of the benefits of the extended transition period for new or revised financial accounting standards. The Company will remain an emerging growth company until the earliest of (i) the last day of the fiscal year in which the market value of Common Stock that is held by non-affiliates exceeds $700 million as of the end of that year’s second fiscal quarter, (ii) the last day of the fiscal year in which the Post-Combination Company has total annual gross revenue of $1.07 billion or more during such fiscal year (as indexed for inflation), (iii) the date on which the Company has issued more than $1 billion in non-convertible debt in the prior three-year period or (iv) December 31, 2024, and the Company expects to continue to take advantage of the benefits of the extended transition period, although it may decide to early adopt such new or revised accounting standards to the extent permitted by such standards. This may make it difficult or impossible to compare the Company’s financial results with the financial results of another public company that is either not an emerging growth company or is an emerging growth company that has chosen not to take advantage of the extended transition period exemptions because of the potential differences in accounting standards used.
Restricted Cash	Restricted cash primarily represents deposited cash that is restricted by financial institutions for two purposes. $0.4 million is restricted as collateral for a letter of credit issued to the Company’s landlord in accordance with the terms of a lease agreement entered into in December 2020. A portion of this restricted cash ($0.1 million) is classified as a current asset as it will be returned to the Company one year following the completion of the Business Combination with SRAC, while the remaining $0.3 million is classified as a non-current asset as it will be returned to the Company upon the occurrence of future events which are expected to occur beyond at least one year from September 30, 2021. $0.7 million is restricted for expenditures related to the National Security Agreement (“NSA”) See Note 12.
Revenue Recognition	The Company enters into contracts for ‘last-mile’ satellite and cargo delivery, payload hosting and in-orbit servicing options with customers that are primarily in the aerospace industry. From inception to September 30, 2021, the Company has not completed a commercial launch of customer cargo and as a result, has not recognized revenue to date for services. However, as of September 30, 2021 and December 31, 2020, the Company has signed contracts with customers including firm orders and options (some of which have already been exercised by customers) and has collected $1.6 million and $2.6 million, respectively, in customer deposits, which are recorded as current and non-current contract liabilities in the Company’s condensed consolidated balance sheet. Included in the collected amount as of September 30, 2021 are $1.6 million of non-current deposits. The Company’s first launch with customers is currently anticipated to occur as early as June 2022, subject to receipt of licenses and government approvals, and successful completion of our current efforts to get the system ready for flight. While a portion of the deposit balance relates to performance obligations that may be satisfied over the next 12 months, the Company will classify customer deposits as non-current until the inaugural launch date is reasonably assured. The Company will recognize revenue (along with any other fees that have been paid) upon the earlier of the satisfaction of the Company’s performance obligation or when the customer cancels the contract. For the nine months ended September 30, 2021, the Company recognized revenue related to customer cancelled contracts of $0.3 million, which were previously recorded as a contract liability. The Company also recorded $(0.14) million as a reduction of cost of revenue which represents the reversal of a contingency recorded during the prior year for loss contracts. During the three months ended September 30, 2021 the Company signed amendments with those customers such that the services will no longer be free of charge. The reversed contingency was offset by costs incurred related to one of the cancelled contracts. While the Company’s standard contracts do not contain refund or recourse provisions that enable its customers to recover any non-refundable fees that have been paid, the Company may issue full or partial refunds to customers on a case-by-case basis as necessary to preserve and foster future business relationships and customer goodwill. As a result of the Company’s inability to complete any launches in 2021 (refer to Note 4 for additional information), the Company issued customer refunds of $1.4 million during the three months ended September 30, 2021.
SAFE Notes	The Company issued Simple Agreement for Future Equity (“SAFE”) notes to investors during the three months ended March 31, 2021 and the years ended December 31, 2020 and 2019, which were converted to shares of common stock in connection with the Business Combination. Prior to conversion, the Company determined that the SAFE notes were not a legal form of debt (i.e., no creditors’ rights). The SAFE notes included a provision allowing for the investors to receive a portion of the proceeds upon a change of control equal to the greater of their investment amount or the amount payable based upon a number of shares of common stock equal to the investment amount divided by the liquidity price, the occurrence of which is outside the control of the Company. This provision required that the SAFE notes be classified as marked-to-market liabilities pursuant to ASC 480. See Note 9 for more information.
Deferred Offering Costs	Offering costs consist of legal, accounting, underwriting fees and other costs incurred that were directly related to the Company’s Business Combination. Upon completion of the Business Combination, all deferred offering costs were netted with proceeds from the Business Combination, with costs relating to the issuance of equity recorded as a reduction of the amount of equity raised, presented in additional paid in capital, while all costs related to the liability classified warrants was estimated and charged to expense. See Note 3 for more information.
Fair Value Measurement	The Company uses valuation approaches that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible. A three-tiered hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value. This hierarchy requires that the Company use observable market data, when available, and minimize the use of unobservable inputs when determining fair value: •Level 1, observable inputs such as quoted prices in active markets; •Level 2, inputs other than the quoted prices in active markets that are observable either directly or indirectly; •Level 3, unobservable inputs in which there is little or no market data, which requires that the Company develop its own assumptions. The fair values of cash and cash equivalents, accounts payable, and certain prepaid and other current assets and accrued expenses approximate carrying values due to the short-term maturities of these instruments which fall with Level 1 of the fair value hierarchy. The carrying value of certain other non-current assets and liabilities approximates fair value. The Company had no Level 2 inputs on September 30, 2021 and December 31, 2020. The Company’s SAFE note liabilities, prior to conversion in connection with the Business Combination, were marked-to-market liabilities pursuant to ASC 480 and were classified within Level 3 of the fair value hierarchy as the Company was using a backsolve method within the Black Scholes Option Pricing model, which allowed the Company to solve for the implied value of the business based on the terms of the SAFE investments. Significant unobservable inputs included volatility and expected term. The Company performed a fair value measurement of the SAFE notes on the Closing Date and recorded the change in the fair value of the instruments prior to converting them to equity.
Warrant Liability	The Company’s Private Warrants and Stock Purchase Warrants (defined and discussed in Note 11) are recorded as derivative liabilities pursuant to ASC 815 and are classified within Level 3 of the fair value hierarchy as the Company is using the Black Scholes Option Pricing model to calculate fair value. Significant unobservable inputs, prior to the Company’s stock being publicly listed, included stock price, volatility and expected term. At the end of each reporting period, changes in fair value during the period are recognized as a components of other income (expense), net within the condensed consolidated statements of operations. The Company will continue to adjust the warrant liabilities for changes in fair value until the earlier of a) the exercise or expiration of the warrants or b) the redemption of the warrants, at which time the warrants will be reclassified to additional paid-in capital. The warrants issued by Momentus Inc. prior to the Business Combination were redeemed in connection with the Merger and as a result, the Company performed a fair value measurement of those notes on the Closing Date and recorded the change in the instruments’ fair values prior to converting them to equity. The warrants assumed by the Company as a result of the Business Combination remain outstanding.
Basic and Diluted Income (Loss) Per Share	Net income (loss) per share is provided in accordance with FASB ASC 260-10, “Earnings per Share”. Basic net income (loss) per share is computed by dividing losses available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted income (loss) per share gives effect to all dilutive potential common shares outstanding during the period. Diluted loss per share excludes all potential common shares and SAFE notes if their effect is anti-dilutive.
Recently Issued and Recently Adopted Accounting Standards	In August 2020, the FASB issued ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, which simplifies the guidance on the issuer’s accounting for convertible debt instruments by removing the separation models for (1) convertible debt with a cash conversion feature and (2) convertible instruments with a beneficial conversion feature. As a result, entities will not separately present in equity an embedded conversion feature in such debt. Instead, they will account for a convertible debt instrument wholly as debt, unless certain other conditions are met. The elimination of these models will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that was within the scope of those models before the adoption of ASU 2020-06. Also, ASU 2020-06 requires the application of the if-converted method for calculating diluted earnings per share and the treasury stock method will be no longer available. The provisions of ASU 2020-06 are applicable for fiscal years beginning after December 15, 2021, with early adoption permitted no earlier than fiscal years beginning after December 15, 2020. The Company is currently evaluating the impact of ASU 2020-06 on its financial statements. Although there are several other new accounting pronouncements issued or proposed by the FASB, which have been adopted or will be adopted as applicable, management does not believe any of these accounting pronouncements has had or will have a material impact on the Company’s financial position or results of operations. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the accounting for income taxes, which simplifies the accounting for income taxes by removing certain exceptions to the general principles in income taxes. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted this standard on January 1, 2021. The adoption of this standard did not have a material impact on the Company’s financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This guidance is intended to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet and disclosing key information about lease arrangements. The Company adopted the standard as of January 1, 2020, using the modified retrospective approach and has elected to use the optional transition method which allows the Company to apply the guidance of ASC 840, including disclosure requirements, in the comparative periods presented. In addition, the Company elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed the Company to carry forward the historical lease classification related to agreements entered prior to adoption. The adoption of the new standard resulted in recognition of operating lease ROU assets and operating lease liabilities of $0.55 million and $0.56 million, respectively, as of January 1, 2020. There was no material cumulative impact of transition to accumulated deficit as of the adoption date. The standard did not materially impact the accompanying statements of operations and had no impact on the accompanying statements of cash flows.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

On August 12, 2021, the Company consummated a merger pursuant to certain Agreement and Plan of Merger, dated October 7, 2020, and as amended on March 5, 2021, April 6, 2021, and June 29, 2021 (the “Merger Agreement”), by and among Stable Road Acquisition Corp (“SRAC”), Project Marvel First Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of SRAC (“First Merger Sub”), and Project Marvel Second Merger Sub, LLC, a Delaware limited liability company and a direct, wholly owned subsidiary of SRAC (“Second Merger Sub”), pursuant to which First Merger Sub merged with and into Momentus Inc., a Delaware corporation (“Legacy Momentus”) with Legacy Momentus as the surviving corporation of the First Merger Sub, and immediately following which Legacy Momentus merged with and into the Second Merger Sub, with the Second Merger Sub as the surviving entity (the “Business Combination”). In connection with the closing of the Business Combination (the “Closing”), the Company changed its name from Stable Road Acquisition Corp. to Momentus Inc., and Legacy Momentus changed its name to Momentus Space, LLC.

The Merger was accounted for as a reverse recapitalization under ASC Topic 805, Business Combinations ("ASC 805") in accordance with accounting principles generally accepted in the United States (“GAAP”). Under this method of accounting, SRAC, who was the legal acquirer, is treated as the “acquired” company for financial reporting purposes and Legacy Momentus is treated as the accounting acquirer. Accordingly, for accounting purposes, the Merger is treated as the equivalent of a capital transaction in which Legacy Momentus issued stock for the net assets of SRAC, with no goodwill or other intangible assets recorded, and Legacy Momentus’ financial statements became those of the Company. Reported shares and earnings per share available to holders of the Company’s common stock, prior to the Business Combination, have been retroactively restated as shares reflecting the exchange ratio established in the Business Combination. See Note 3 for more information.

Unaudited Interim Financial Information and Basis of Presentation

The accompanying interim unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and pursuant to the rules and regulations of the Securities and Exchange Commission. 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. The balance sheet as of December 31, 2020 was derived from the Company’s audited financial statements but does not include all disclosures required by GAAP for audited financial statements. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited financial statements. In the opinion of the Company’s management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments that are necessary to present fairly the Company’s financial position as of September 30, 2021 and December 31, 2020, the net income (loss) for the three and nine months ended September 30, 2021 and 2020, the stockholders’ equity (deficit) for the three and nine months ended September 30, 2021 and 2020, and cash flows for the nine months ended September 30, 2021 and 2020. Such adjustments are of a normal and recurring nature. The results for the three and nine months ended September 30, 2021 are not necessarily indicative of the results for the year ending December 31, 2021, or for any future period. These interim condensed consolidated financial statements should be read in conjunction with the audited financial statements as of and for the years ended December 31, 2020 and 2019, filed with the Securities and Exchange Commission (the “SEC”) in SRAC’s proxy statement on July 21, 2021.

The Business Combination was accounted for as a reverse recapitalization in accordance with U.S. GAAP. Under this method of accounting, SRAC is treated as the acquired company and Momentus Inc. is treated as the acquirer for financial statement reporting purposes (the “Combined Company”). Momentus Inc. was determined to be the accounting acquirer as Momentus Inc.'s shareholders prior to the Merger had the greatest voting interest in the combined entity, Momentus Inc. comprises all of the ongoing operations, and Momentus Inc.'s senior management directs operations of the combined entity.

Accordingly, for accounting purposes, the financial statements of the Combined Company represent a continuation of the financial statements of Momentus with the acquisition being treated as the equivalent of Momentus issuing stock for the net assets of SRAC, accompanied by a recapitalization. The net assets of SRAC are recorded at historical cost, with no goodwill or other intangible assets recorded.

One-time direct and incremental transaction costs incurred by the Company were recorded based on the activities to which the costs relate and the structure of the transaction; cost allocated to the issuance of equity were recorded as a reduction of the amount of equity raised, presented in additional paid in capital, while all costs allocated to the liability classified warrants were charged to expense.

In connection with the Business Combination, outstanding units of Momentus were converted into common stock of the Company, par value $0.00001 per share, representing a recapitalization. Momentus is deemed to be the predecessor of the Company, and the consolidated assets and liabilities and results of operations prior to the Closing Date are those of Momentus. The shares and corresponding capital amounts and net income (loss) per share available to common stockholders, prior to the Business Combination, have been retroactively restated as shares reflecting the exchange ratio established in the Business Combination Agreement.

Reclassifications

Certain reclassifications have been made to the prior year’s financial statements to conform to the current year’s presentation. None of the reclassifications have changed the total assets, liabilities, stockholders’ deficit, income, expenses or net losses previously reported.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Accordingly, actual results could differ from those estimates. Significant estimates inherent in the preparation of the financial statements include, but are not limited to, accounting for useful lives of property, machinery and equipment, net, intangible assets, net, accrued liabilities, income taxes including deferred tax assets and liabilities, impairment valuation, stock-based awards, SAFE notes and warrant liabilities.

Emerging Growth Company Status

Section 102(b)(1) of the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”) exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can choose not to take advantage of the extended transition period and comply with the requirements that apply to non-emerging growth companies, and any such election to not take advantage of the extended transition period is irrevocable. The Company is an “emerging growth company” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”) and has elected to take advantage of the benefits of the extended transition period for new or revised financial accounting standards. The Company will remain an emerging growth company until the earliest of (i) the last day of the fiscal year in which the market value of Common Stock that is held by non-affiliates exceeds $700 million as of the end of that year’s second fiscal quarter, (ii) the last day of the fiscal year in which the Post-Combination Company has total annual gross revenue of $1.07 billion or more during such fiscal year (as indexed for inflation), (iii) the date on which the Company has issued more than $1 billion in non-convertible debt in the prior three-year period or (iv) December 31, 2024, and the Company expects to continue to take advantage of the benefits of the extended transition period, although it may decide to early adopt such new or revised accounting standards to the extent permitted by such standards. This may make it difficult or impossible to compare the Company’s financial results with the financial results of another public company that is either not an emerging growth company or is an emerging growth company that has chosen not to take advantage of the extended transition period exemptions because of the potential differences in accounting standards used.

Restricted Cash

Restricted cash primarily represents deposited cash that is restricted by financial institutions for two purposes. $0.4 million is restricted as collateral for a letter of credit issued to the Company’s landlord in accordance with the terms of a lease agreement entered into in December 2020. A portion of this restricted cash ($0.1 million) is classified as a current asset as it will be returned to the Company one year following the completion of the Business Combination with SRAC, while the remaining $0.3 million is classified as a non-current asset as it will be returned to the Company upon the occurrence of future events which are expected to occur beyond at least one year from September 30, 2021. $0.7 million is restricted for expenditures related to the National Security Agreement (“NSA”) See Note 12.

Revenue Recognition

The Company enters into contracts for ‘last-mile’ satellite and cargo delivery, payload hosting and in-orbit servicing options with customers that are primarily in the aerospace industry. From inception to September 30, 2021, the Company has not completed a commercial launch of customer cargo and as a result, has not recognized revenue to date for services. However, as of September 30, 2021 and December 31, 2020, the Company has signed contracts with customers including firm orders and options (some of which have already been exercised by customers) and has collected $1.6 million and $2.6 million, respectively, in customer deposits, which are recorded as current and non-current contract liabilities in the Company’s condensed consolidated balance sheet. Included in the collected amount as of September 30, 2021 are $1.6 million of non-current deposits. The Company’s first launch with customers is currently anticipated to occur as early as June 2022, subject to receipt of licenses and government approvals, and successful completion of our current efforts to get the system ready for flight. While a portion of the deposit balance relates to performance obligations that may be satisfied over the next 12 months, the Company will classify customer deposits as non-current until the inaugural launch date is reasonably assured.

The Company will recognize revenue (along with any other fees that have been paid) upon the earlier of the satisfaction of the Company’s performance obligation or when the customer cancels the contract. For the nine months ended September 30, 2021, the Company recognized revenue related to customer cancelled contracts of $0.3 million, which were previously recorded as a contract liability. The Company also recorded $(0.14) million as a reduction of cost of revenue which represents the reversal of a contingency recorded during the prior year for loss contracts. During the three months ended September 30, 2021 the Company signed amendments with those customers such that the services will no longer be free of charge. The reversed contingency was offset by costs incurred related to one of the cancelled contracts.

While the Company’s standard contracts do not contain refund or recourse provisions that enable its customers to recover any non-refundable fees that have been paid, the Company may issue full or partial refunds to customers on a case-by-case basis as necessary to preserve and foster future business relationships and customer goodwill. As a result of the Company’s inability to complete any launches in 2021 (refer to Note 4 for additional information), the Company issued customer refunds of $1.4 million during the three months ended September 30, 2021.

SAFE Notes

The Company issued Simple Agreement for Future Equity (“SAFE”) notes to investors during the three months ended March 31, 2021 and the years ended December 31, 2020 and 2019, which were converted to shares of common stock in connection with the Business Combination. Prior to conversion, the Company determined that the SAFE notes were not a legal form of debt (i.e., no creditors’ rights). The SAFE notes included a provision allowing for the investors to receive a portion of the proceeds upon a change of control equal to the greater of their investment amount or the amount payable based upon a number of shares of common stock equal to the investment amount divided by the liquidity price, the occurrence of which is outside the control of the Company. This provision required that the SAFE notes be classified as marked-to-market liabilities pursuant to ASC 480. See Note 9 for more information.

Deferred Offering Costs

Offering costs consist of legal, accounting, underwriting fees and other costs incurred that were directly related to the Company’s Business Combination. Upon completion of the Business Combination, all deferred offering costs were netted with proceeds from the Business Combination, with costs relating to the issuance of equity recorded as a reduction of the amount of equity raised, presented in additional paid in capital, while all costs related to the liability classified warrants was estimated and charged to expense. See Note 3 for more information.

Fair Value Measurement

The Company uses valuation approaches that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible. A three-tiered hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value. This hierarchy requires that the Company use observable market data, when available, and minimize the use of unobservable inputs when determining fair value:

•Level 1, observable inputs such as quoted prices in active markets;

•Level 2, inputs other than the quoted prices in active markets that are observable either directly or indirectly;

•Level 3, unobservable inputs in which there is little or no market data, which requires that the Company develop its own assumptions.

The fair values of cash and cash equivalents, accounts payable, and certain prepaid and other current assets and accrued expenses approximate carrying values due to the short-term maturities of these instruments which fall with Level 1 of the fair value hierarchy. The carrying value of certain other non-current assets and liabilities approximates fair value. The Company had no Level 2 inputs on September 30, 2021 and December 31, 2020.

The Company’s SAFE note liabilities, prior to conversion in connection with the Business Combination, were marked-to-market liabilities pursuant to ASC 480 and were classified within Level 3 of the fair value hierarchy as the Company was using a backsolve method within the Black Scholes Option Pricing model, which allowed the Company to solve for the implied value of the business based on the terms of the SAFE investments. Significant unobservable inputs included volatility and expected term. The Company performed a fair value measurement of the SAFE notes on the Closing Date and recorded the change in the fair value of the instruments prior to converting them to equity.

Warrant Liability

The Company’s Private Warrants and Stock Purchase Warrants (defined and discussed in Note 11) are recorded as derivative liabilities pursuant to ASC 815 and are classified within Level 3 of the fair value hierarchy as the Company is using the Black Scholes Option Pricing model to calculate fair value. Significant unobservable inputs, prior to the Company’s stock being publicly listed, included stock price, volatility and expected term. At the end of each reporting period, changes in fair value during the period are recognized as a components of other income (expense), net within the condensed consolidated statements of operations. The Company will continue to adjust the warrant liabilities for changes in fair value until the earlier of a) the exercise or expiration of the warrants or b) the redemption of the warrants, at which time the warrants will be reclassified to additional paid-in capital.

The warrants issued by Momentus Inc. prior to the Business Combination were redeemed in connection with the Merger and as a result, the Company performed a fair value measurement of those notes on the Closing Date and recorded the change in the instruments’ fair values prior to converting them to equity. The warrants assumed by the Company as a result of the Business Combination remain outstanding.

Basic and Diluted Income (Loss) Per Share

Net income (loss) per share is provided in accordance with FASB ASC 260-10, “Earnings per Share”. Basic net income (loss) per share is computed by dividing losses available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted income (loss) per share gives effect to all dilutive potential common shares outstanding during the period. Diluted loss per share excludes all potential common shares and SAFE notes if their effect is anti-dilutive.

Recently Issued and Recently Adopted Accounting Standards

In August 2020, the FASB issued ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, which simplifies the guidance on the issuer’s accounting for convertible debt instruments by removing the separation models for (1) convertible debt with a cash conversion feature and (2) convertible instruments with a beneficial conversion feature. As a result, entities will not separately present in equity an embedded conversion feature in such debt. Instead, they will account for a convertible debt instrument wholly as debt, unless certain other conditions are met. The elimination of these models will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that was within the scope of those models before the adoption of ASU 2020-06. Also, ASU 2020-06 requires the application of the if-converted method for calculating diluted earnings per share and the treasury stock method will be no longer available. The provisions of ASU 2020-06 are applicable for fiscal years beginning after December 15, 2021, with early adoption permitted no earlier than fiscal years beginning after December 15, 2020. The Company is currently evaluating the impact of ASU 2020-06 on its financial statements.

Although there are several other new accounting pronouncements issued or proposed by the FASB, which have been adopted or will be adopted as applicable, management does not believe any of these accounting pronouncements has had or will have a material impact on the Company’s financial position or results of operations.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the accounting for income taxes, which simplifies the accounting for income taxes by removing certain exceptions to the general principles in income taxes. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted this standard on January 1, 2021. The adoption of this standard did not have a material impact on the Company’s financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This guidance is intended to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet and disclosing key information about lease arrangements. The Company adopted the standard as of January 1, 2020, using the modified retrospective approach and has elected to use the optional transition method which allows the Company to apply the guidance of ASC 840, including disclosure requirements, in the comparative periods presented. In addition, the Company elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed the Company to carry forward the historical lease classification related to agreements entered prior to adoption.

The adoption of the new standard resulted in recognition of operating lease ROU assets and operating lease liabilities of $0.55 million and $0.56 million, respectively, as of January 1, 2020. There was no material cumulative

impact of transition to accumulated deficit as of the adoption date. The standard did not materially impact the accompanying statements of operations and had no impact on the accompanying statements of cash flows.