Description of Organization and Business Operations | NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS ECP Environmental Growth Opportunities Corp. is a blank check company formed as a Delaware corporation on October 29, 2020. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses that the Company has not yet identified (“Business Combination”). As of December 31, 2020, the Company had not yet commenced operations. All activity for the period from October 29, 2020 (inception) through December 31, 2020 relates to the Company’s formation and the Proposed Public Offering, which is described below. The Company has selected December 31 as its fiscal year end. The Company’s ability to commence operations is contingent upon obtaining adequate financial resources through a proposed initial public offering of 30,000,000 units at $10.00 per unit (or 34,500,000 shares if the underwriters’ option to purchase additional shares is exercised in full) (“Units” and, with respect to the Class A common stock included in the Shares being offered, the “Public Shares”) which is discussed in Note 3 (the “Proposed Public Offering”). The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Proposed Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets that together have an aggregate fair market value equal to at least 80% of the net assets held in the Trust Account (as defined below) (excluding the deferred underwriting commissions and taxes payable on the interest earned on the Trust Account) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise is not required to register as an investment company under the Investment Company Act 1940, as amended, or the Investment Company Act. Upon the closing of the Proposed Public Offering, management has agreed that an amount equal to at least $10.00 per Unit sold in the Proposed Public Offering, including the proceeds of the Private Placement Warrants, will be held in a trust account (“Trust Account”) with American Stock Transfer & Trust Company, LLC acting as trustee and invested in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act having a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 promulgated under the Investment Company Act which invest only in direct U.S. government treasury obligations, as determined by the Company, until the earlier of: (i) the completion of a Business Combination and (ii) the distribution of the Trust Account as described below. The Company will provide its holders of the Public Shares (the “Public Stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek stockholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Stockholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share amount to be distributed to Public Stockholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 6). These Public Shares will be recorded at a redemption value and classified as temporary equity upon the completion of the Proposed Public Offering, in accordance with Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity.” In such case, the Company will proceed with a Business Combination if the Company has net tangible assets of at least $5,000,001 upon such consummation of a Business Combination and a majority of the shares voted are voted in favor of the Business Combination. If a stockholder vote is not required by law and the Company does not decide to hold a stockholder vote for business or other legal reasons, the Company will, pursuant to the amended and restated certificate of incorporation, which will be adopted by the Company upon the consummation of the Proposed Public Offering (the “Amended and Restated Certificate of Incorporation”), conduct the redemptions pursuant to the tender offer rules of the U.S. Securities and Exchange Commission (the “SEC”), and file tender offer documents with the SEC prior to completing a Business Combination. If, however, a stockholder approval of the transactions is required by law, or the Company decides to obtain stockholder approval for business or legal reasons, the Company will offer to redeem shares in conjunction with a proxy solicitation pursuant to the proxy rules and not pursuant to the tender offer rules. Additionally, each Public Stockholder may elect to redeem their Public Shares irrespective of whether they vote for or against the proposed transaction. If the Company seeks stockholder approval in connection with a Business Combination, the holders of the Founder Shares prior to this Proposed Public Offering (the “Initial Stockholders”) have agreed to vote their Founder Shares (as defined in Note 5) and any Public Shares purchased during or after the Proposed Public Offering in favor of a Business Combination. In addition, the Initial Stockholders have agreed to waive their redemption rights with respect to their Founder Shares and Public Shares in connection with the completion of a Business Combination. Notwithstanding the foregoing, the Company’s Amended and Restated Certificate of Incorporation will provide that a Public Stockholder, together with any affiliate of such stockholder or any other person with whom such stockholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 15% or more of the Class A common stock sold in the Proposed Public Offering, without the prior consent of the Company. The Company’s Sponsor, executive officers, directors and director nominees will have agreed not to propose an amendment to the Company’s Amended and Restated Certificate of Incorporation that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Stockholders with the opportunity to redeem their Class A common stock in conjunction with any such amendment. If the Company is unable to complete a Business Combination within 24 months from the closing of the Proposed Public Offering (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up; (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to pay its taxes, if any (less up to $100,000 of interest to pay dissolution expenses) divided by the number of the then-outstanding Public Shares, which redemption will completely extinguish Public Stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any); and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining stockholders and the board of directors, liquidate and dissolve, subject in each case to the Company’s obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law. There will be no redemption rights or liquidating distributions with respect to the Company’s warrants, which will expire worthless if the Company fails to complete a Business Combination within the Combination Period. In connection with the redemption of 100% of the Company’s outstanding Public Shares for a portion of the funds held in the Trust Account, each holder will receive a full pro rata portion of the amount then in the Trust Account, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay the Company’s taxes (less up to $100,000 of interest to pay dissolution expenses). The Initial Stockholders have agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Stockholders should acquire Public Shares in or after the Proposed Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters have agreed to waive their rights to their deferred underwriting commission (see Note 6) held in the Trust Account in the event the Company does not complete a Business Combination within in the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per public share and (ii) the actual amount per public share held in the trust account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Proposed Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Going Concern Consideration As of December 31, 2020, the Company had $24,980 in cash and a working capital deficiency of $344,399. Further, the Company has incurred and expect to continue to incur significant costs in pursuit of its financing and acquisition plans. Management plans to address this need for capital through the Proposed Public Offering. The Company cannot assure that its plans to raise capital or to consummate an initial Business Combination will be successful. In addition, management is currently evaluating the impact of the COVID-19 pandemic and its effect on the Company’s financial position, results its operations and/or closing of the Proposed Public Offering and search for a target company. These factors, among others, raise substantial doubt about the Company’s ability to continue as a going concern. The financial statements do not include any adjustments that might result from its inability to consummate the Proposed Public Offering or its inability to continue as a going concern. | Note 1—Description of Organization ECP Environmental Growth Opportunities Corp. (the “Company”) is a blank check company formed as a D e October 29, 2020 . T he Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization , As of September 30, 2021, the Company had not commenced any operations. All activity through September 30, 2021 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), which is described below. The Company has selected December 31 as its fiscal year end. On February 11, 2021, the Company consummated its Initial Public Offering of 34,500,000 units (the “Units”), including 4,500,000 Units sold pursuant to the full exercise of the underwriters’ option to purchase additional Units to cover over-allotments. The Units were sold at a price of $10.00 per unit, generating gross proceeds to the Company of $345,000,000, which is described in Note 4 Simultaneously with the closing of the Initial Public Offering, the Company completed two private sales of an aggregate 6,266,667 warrants (the “Private Placement Warrants”) at a purchase price of $1.50 per Private Placement Warrant (the “Private Placements”), to ENNV Holdings, LLC (the “Sponsor”) and Goldman Sachs Asset Management, L.P. (“GSAM”), in its capacity as investment adviser on behalf of its clients (the “GSAM Client Accounts”), generating aggregate gross proceeds to the Company of $9,400,000, which is described in Note 4 Offering costs consist of legal, accounting, underwriting and other costs incurred through the condensed consolidated balance sheet date that are directly related to the Initial Public Offering. Upon the completion of the Initial Public Offering in February 2021, the offering costs totaling $19,606,427 were allocated between stockholders’ equity ($18,855,685) and other expenses ($750,743) based on the fair value of warrant liabilities relative to the Initial Public Offering proceeds recognized in stockholders’ equity. During the quarter ended June 30, 2021, an additional $2.5 million in offering costs were recogni zed party, as well as approximately $35,000 additional cash offering costs. Following the closing of the Initial Public Offering on February 11, 2021, an amount of $345,000,000 ($10.00 per Unit) comprised of of the 100% of its public shares if the 24 months from the closing of the Initial Public Offering or (ii) with respect to any On July 18, 2021, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and among the Company, Merger Sub, and Fast Radius, Inc., a Delaware corporation (“Fast Radius”), pursuant to which Merger Sub will merge with and into Fast Radius, with Fast Radius surviving such merger as a wholly owned subsidiary of the Company (the “Merger” and, together with the other transactions contemplated by the Merger Agreement, the “Business Combination”). At the closing of the Merger (the “Closing”), the Company will be renamed “Fast Radius, Inc.” The Business Combination is expected to be consummated in the fourth quarter of 2021, subject to the fulfillment of certain customary closing conditions. Subject to the terms of the Merger Agreement, the aggregate merger consideration with respect to all holders of Fast Radius securities outstanding immediately prior to the Closing, which will be issued in the form of shares or equity awards relating to shares of Class A common stock, will equal 100,000,000 shares of Class A common stock at a deemed value of $10.00 per share (the “Aggregate Merger Consideration”). The Aggregate Merger Consideration will be issued to holders of Fast Radius securities at the Closing in accordance with the Merger Agreement, except that the issuance to holders of Fast Radius capital stock and Vested RSUs (as defined in the Merger Agreement) of a portion of the Aggregate Merger Consideration in an amount equal to 10,000,000 shares of Class A common stock (the “Fast Radius Earn Out Shares”) will be subject to the satisfaction of certain price targets set forth in the Merger Agreement during the five-year period following the Closing (the “Earn Out Period”), which price targets will be based upon (i) the daily volume-weighted average sale price of shares of Class A common stock quoted on The Nasdaq Capital Market (“NASDAQ”), or the exchange on which the shares of Class A common stock are then traded, for any 20 trading days within any 30 consecutive trading day period within the Earn Out Period or (ii) the per share consideration received in connection with the occurrence of certain change of control events of the combined company following Closing specified in the Merger Agreement (any such event, an “Acquiror Sale”). In the event of an Acquiror Sale in which the per share consideration received is less than a price target set forth in the Merger Agreement that has not previously occurred, the applicable provisions of the Merger Agreement will terminate and no Fast Radius Earn Out Shares will be issuable thereunder with respect to such price target in connection with or following completion of such Acquiror Sale. The Fast Radius Earn Out Shares will be issuable in two equal tranches of 5,000,000 shares of Class A common stock at the time that the Class A common stock reaches a value, as calculated above, of $15.00 and $20.00, respectively, and will be allocated among the applicable holders of Fast Radius capital stock and Vested RSUs on a pro rata basis in accordance with the Merger Agreement. In connection with the Closing, the shares (the “Founder Shares”) of Class B common stock issued prior to the Company’s initial public offering that are held by the Sponsor, our independent directors and GSAM will automatically convert into shares of Class A common stock on a one-for-one In connection with the execution of the Merger Agreement, the Company entered into subscription agreements (collectively, the “Subscription Agreements”) with certain investors, including the Sponsor (collectively, the “PIPE Investors”), pursuant to which the PIPE Investors agreed to subscribe for and purchase, and the Company agreed to issue and sell to the PIPE Investors, an aggregate of 7,500,000 shares of Class A common stock (1,000,000 shares of which will be issued and sold to the Sponsor in its capacity as a PIPE Investor) for a purchase price of $10.00 per share, or an aggregate of $75,000,000, in a private placement (the “PIPE Investment”). The closing of the PIPE Investment will occur substantially concurrently with the consummation of the Business Combination and is conditioned thereon and on other customary closing conditions. The shares of Class A common stock to be issued pursuant to the Subscription Agreements will not be registered under the Securities Act and will be issued in reliance upon the exemption provided under Section 4(a)(2) of the Securities Act . The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets that together have an aggregate fair market value equal to at least 80% of the net assets held in the Trust Account (as defined below) (excluding the deferred underwriting commissions and taxes payable on the interest earned on the Trust Account) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise is not required to register as an investment company under the Investment Company Act 1940, as amended, or the Investment Company Act. Upon the closing of the Initial Public Offering, an amount equal to at least $10.00 per Unit sold in the Initial Public Offering, including the proceeds of the Private Placement Warrants, are held in a trust account (“Trust Account”) with the American Stock Transfer & Trust Company acting as trustee and invested in money market funds meeting certain conditions under Rule 2a-7 promulgated under the Investment Company Act which invest only in direct U.S. government treasury obligations, as determined by the Company, until the earlier of: (i) the completion of a Business Combination and (ii) the distribution of the Trust Account as described below. The Company will provide its holders of the public shares (the “Public Stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek stockholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Stockholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share Shares prior to this Initial Public Offering (the “Initial Stockholders”) have agreed to vote their Founder Shares (as defined in Note 5) and any Public Shares purchased during or after the Initial Public Offering in favor of a Business Combination. In addition, the Initial Stockholders have agreed to waive their redemption rights with respect to their Founder Shares and Public Shares in connection with the completion of a Business Combination. Notwithstanding the foregoing, the Company’s Amended and Restated Certificate of Incorporation will provide that a Public Stockholder, together with any affiliate of such stockholder or any other person with whom such stockholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 15% or more of the Class A common stock without the prior consent of the Company. The Company’s Sponsor, executive officers, directors and director nominees have agreed not to propose an amendment to the Company’s Amended and Restated Certificate of Incorporation that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem % of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Stockholders with the opportunity to redeem their Class A common stock in conjunction with any such amendment. If the Company is unable to e of interest to pay dissolution expenses) divided by the number of the then-outstanding Public Shares, which redemption will completely extinguish Public Stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any); and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining stockholders and the board of directors, liquidate and dissolve, subject in each case to the Company’s obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law. There will be no redemption rights or liquidating distributions with respect to the Company’s warrants, which will expire worthless if the Company fails to complete a Business Combination within the Combination Period. In connection with the redemption of % of the Company’s outstanding Public Shares for a portion of the funds held in the Trust Account, each holder will receive a full pro rata portion of the amount then in the Trust Account, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay the Company’s taxes (less up to $ of interest to pay dissolution expenses). The Initial Stockholders have agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Stockholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters have agreed to waive their rights to their deferred underwriting commission (see Note 6 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $ per public share and (ii) the actual amount per public share held in the trust account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Going Concern Consideration As of September On July 30, 2021, the Company issued an unsecured promissory note . The terms of the Working Capital Warrants will be identical to the terms of the warrants issued by the Company to the Sponsor in a private placement that took place simultaneously with the Company’s Initial Public Offering. The Note is subject to customary events of default, the occurrence of which automatically trigger the unpaid principal balance of the Note and all other sums payable with regard to the Note becoming immediately due and payable. As of September 30, 2021, the $399,702 drawn against the Note has not been converted to warrants. If the Company is unable to raise additional capital, it may be required to take additional measures to conserve liquidity, which could include, but not necessarily be limited to, suspending the pursuit of a Business Combination. The Company cannot provide any assurance that new financing will be available to it on commercially acceptable terms, if at all. As a result of the above, in connection with the Company’s assessment of going concern considerations in accordance with Accounting Standards Update (“ASU”) 2014-15, Risks and Uncertainties Management continues to evaluate the impact of the COVID-19 as of the date of the condensed consolidated financial statements. The condensed consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty. |