Area of leased space Summary of Significant Accounting Policies [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Income tax payable Accrued Income Taxes, Current Additional Paid-in Capital [Member] Additional paid-in capital Adjustments to reconcile net (loss) income to net cash used in operating activities: Reversal of offering costs Shares excluded from the computation of net loss per common share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Assets, Fair Value Disclosure [Abstract] ASSETS Assets [Abstract] Total Assets Assets Total Current Assets Assets, Current Current Assets Amount deposited into Trust Account Cash and cash equivalents held in Trust Account Basis of Presentation Merger consideration Business Combination, Consideration Transferred Business Acquisition, Acquiree [Domain] Percentage of membership interest acquired Business Acquisition, Percentage of Voting Interests Acquired Business Acquisition [Axis] Net Change in Cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash and cash equivalents held in Trust Account [Abstract] Cash and Cash Equivalents [Abstract] Cash and cash equivalents held in Trust Account Cash and Cash Equivalents, Fair Value Disclosure Cash - Beginning Cash - Ending Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash held outside of trust account Cash Cash held outside of trust Account Cash and Cash Equivalents Held in Trust Account Cash and Cash Equivalents, Policy [Policy Text Block] Cash and cash equivalents Cash Equivalents, at Carrying Value Non-Cash investing and financing activities: Class of Warrant or Right [Domain] Class of Warrant or Right [Axis] Share price, shares redeemed (in dollars per share) Exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Class of Stock [Line Items] Number of shares called by each warrant (in shares) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Class of Stock [Domain] Commitments Commitments Commitments and Contingencies Disclosure [Text Block] Commitments [Abstract] Class B Common Stock [Member] Common Stock Subject to Possible Redemption [Member] Common Stock Subject to Redemption [Member] Common Stock Subject to Mandatory Redemption [Member] Common Stock [Member] Class A Common Stock [Member] Class A Common Stock [Member] Common stock, par value (in dollars per share) Common stock, shares issued (in shares) Common stock, shares authorized (in shares) Common stock, shares outstanding (in shares) Common stock Deferred Tax Assets [Abstract] Income Taxes [Abstract] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Concentration of Credit Risk US Federal Current Federal Tax Expense (Benefit) US State Current State and Local Tax Expense (Benefit) Total current provision Current Federal, State and Local, Tax Expense (Benefit) Current [Abstract] Principal amount Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Line Items] Debt Instrument, Name [Domain] Interest rate Total deferred benefit provision Deferred Federal, State and Local, Tax Expense (Benefit) US Federal Deferred Federal Income Tax Expense (Benefit) Total deferred provision Deferred Income Tax Expense (Benefit) Deferred [Abstract] Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Total deferred income tax assets Deferred Tax Assets, Gross US State Deferred State and Local Income Tax Expense (Benefit) Deferred tax asset, net of allowance Deferred Tax Assets, Net of Valuation Allowance Valuation allowance Deferred Tax Assets, Valuation Allowance Federal [Member] Monthly deposit into trust account Due from Affiliates Fees payable and outstanding Basic and diluted net loss per share, Common stock (2) Basic and diluted net loss per common share (in dollars per share) Net Loss Per Common Share Earnings Per Share, Policy [Policy Text Block] Net loss per common share [Abstract] Earnings Per Share [Abstract] Change in valuation allowance Statutory federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Other State taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Reconciliation of Federal Income Tax Rate [Abstract] Income tax provision Effective Income Tax Rate Reconciliation, Percent Equity Component [Domain] Stockholders' Equity [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Recurring [Member] Fair Value Measurements [Abstract] Measurement Frequency [Domain] Measurement Frequency [Axis] Fair Value, Recurring and Nonrecurring [Table] Fair Value of Financial Instruments Fair Value Measurements Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Quoted Prices in Active Markets (Level 1) [Member] Significant Other Observable Inputs (Level 2) [Member] Significant Other Unobservable Inputs (Level 3) [Member] Income Tax Authority [Axis] (Loss) income before provision for income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income Taxes [Abstract] STATEMENTS OF OPERATIONS [Abstract] Income Taxes Income Tax Disclosure [Text Block] Income Tax Authority [Domain] Provision for income tax Income Tax Expense (Benefit) Income Taxes Cash paid for income taxes Prepaid income tax Increase (Decrease) in Prepaid Taxes Income tax payable Increase (Decrease) in Income Taxes Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses Increase (Decrease) in Accrued Liabilities Changes in operating assets and liabilities: Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Stockholders' Equity [Roll Forward] Interest available to pay tax obligations Interest Receivable Interest earned on marketable securities held in Trust Account Other Income - dividends and interest Other Income - dividends and interest Initial Public Offering [Member] IPO [Member] Lease contract term Term of option to extend lease TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity LIABILITIES AND STOCKHOLDERS' EQUITY Total Liabilities Liabilities Total Current Liabilities Liabilities, Current Current Liabilities Business combination of lender advance Deferred fee aggregate value for legal firm and transfer agent Loss Contingency, Estimate of Possible Loss Beneficial ownership percentage of outstanding shares Noncontrolling Interest, Ownership Percentage by Parent Non-Redeemable Net Loss Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Numerator: [Abstract] Net Income (Loss) Attributable to Parent [Abstract] Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Net (loss) income Net income (loss) Net (loss) income Net Income (Loss) Attributable to Parent Cash Flows from Investing Activities: Cash Flows from Operating Activities: Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Cash Flows from Financing Activities: Recent Accounting Pronouncements Outstanding amount Promissory note Related party note amount outstanding Loan from sponsor Promissory note- Related party Over-Allotment Option [Member] Over-Allotment Option [Member] Operating and formation costs Operating expenses Loss from operations Operating Income (Loss) Net operating loss carryovers Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Table] Description of Organization and Business Operations Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Description of Organization and Business Operations [Abstract] Payment for redemption of common stock Payment for redemption of common stock Payment for redemption of common stock Payments for Repurchase of Common Stock Investment of cash in Trust Account Payments to Acquire Restricted Investments Preferred stock, shares issued (in shares) Preferred stock, $0.0001 par value; 1,000,000 authorized; none issued and outstanding Preferred stock, shares outstanding (in shares) Preferred stock, par value (in dollars per share) Preferred stock, shares authorized (in shares) Prepaid expenses and other current assets Prepaid income tax Aggregate purchase price Proceeds from issuance of common stock Contribution from sale of founder shares Gross proceeds from initial public offering Proceeds from Issuance Initial Public Offering Proceeds from promissory note Aggregate purchase price of warrants Gross proceeds from issuance of warrants Proceeds from Issuance of Warrants Proceeds from Promissory Note - related party Payment of franchise taxes and income taxes Proceeds from Sale of Restricted Investments Related Party Transactions [Abstract] Related Party [Domain] Related Party Transaction [Line Items] Related Party [Axis] General and administrative expenses Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transactions Related Party Transactions Disclosure [Text Block] Monthly fees for office space, utilities and secretarial and administrative support Related Party Transaction, Expenses from Transactions with Related Party Repayment of debt to related party Retained earnings Retained Earnings [Member] Sale of Stock [Domain] Income Tax Provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Deferred Tax Assets Basic and Diluted Loss Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Reconciliation of Federal Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Stock by Class [Table] Sale price of common stock (in dollars per share) Value per share (in dollars per share) Share Price Options Forfeiture [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period [Abstract] Balance (in shares) Balance (in shares) Shares, Outstanding Warrant price (in dollars per share) Unit price (in dollars per share) Summary of Significant Accounting Policies State [Member] BALANCE SHEETS [Abstract] Statement [Table] Statement [Line Items] STATEMENTS OF CASH FLOWS [Abstract] Equity Components [Axis] Class of Stock [Axis] STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY [Abstract] Founder shares purchased (in shares) Stock Issued During Period, Shares, New Issues Number of shares redeemed (in shares) Stock Redeemed or Called During Period, Shares Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Balance Balance Total Stockholders' Equity Stockholders' Equity Attributable to Parent Stockholders' Equity Stockholders' Equity [Abstract] Stockholders' Equity Note [Abstract] Subsequent Event Type [Axis] Subsequent Events Subsequent Event [Line Items] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Events [Abstract] Subsequent Event [Table] Sale of Stock [Axis] Subsidiary, Sale of Stock [Line Items] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Supplemental Disclosure for Cash Flow activities: Less: Income attributable to common stock subject to possible redemption Income from common stock subject to possible redemption Temporary Equity, Accretion to Redemption Value, Adjustment Common stock subject to possible redemption (in shares) Common stock, subject to possible redemption (in shares) Common stock subject to possible redemption, 7,560,480 and 20,846,454 shares at redemption value at December 31, 2020 and December 31, 2019, respectively Accrued interest and penalties Unrecognized tax benefits Use of Estimates Change in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Public Warrants [Member] Warrant [Member] Warrants expiration period Expiration period upon redemption or liquidation Basic and diluted weighted average shares outstanding, Common stock (1) Weighted average shares outstanding, basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Reconciliation of net loss per common share [Abstract] Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Denominator: [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Affiliate [Member] Affiliated Entity [Member] Management [Member] Maximum [Member] Minimum [Member] Ownership [Domain] Ownership [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Title of Individual [Axis] Title of Individual [Domain] Cover [Abstract] Amendment Flag Current Fiscal Year End Date Document Period End Date Entity Address, State or Province Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Entity Interactive Data Current Entity Shell Company Entity Emerging Growth Company Entity Ex Transition Period Entity Small Business Underwriting Agreement [Abstract] The number of demands that eligible security holder can make Number of Demands Eligible Security Holder Can Make Number of demands eligible security holder can make Registration and Stockholder Rights [Abstract] Registration Rights [Abstract] A written promise to pay a note to an affiliate of a business combination target (the Lender). Promissory Note [Member] The Note [Member] Name of individuals who are holding beneficially ownership of entity outstanding stock. Directors, Executive Officers and Affiliated Entities [Member] Represents the merger agreement of Advent stockholders merger entities Advent Technologies, Inc., a Delaware corporation ("Advent"), and Vassilios Gregoriou. Advent Stockholders [Member] Advent [Member] Subsequent Event Description [Abstract] Classification of common stock representing ownership interest in a corporation. New Common Stock [Member] New Advent Common Stock [Member] UltraCell, LLC, a Delaware limited liability company and a direct wholly-owned subsidiary of Seller ("UltraCell"). UltraCell, LLC [Member] UltraCell [Member] Refers to the subscription agreements, pursuant to which certain investors agreed to purchase, and AMCI agreed to sell to the investors, an aggregate of 6,500,000 shares of AMCI Class A common stock for gross proceeds to AMCI of $65,000,000 (the "PIPE Investment"). Private Investment in Public Equity [Member] PIPE Investment [Member] Name of security holders of former entity. AMCI Security Holders [Member] AMCI [Member] Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to return to provision adjustments. Effective Income Tax Rate Reconciliation Return to Provision Adjustments Return to provision Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from startup costs. Deferred Tax Assets, Startup Costs Startup Costs Operating Loss Carryforwards [Abstract] Operating Loss Carryforwards [Abstract] Number of business days before company sends notice of redemption to warrant holders, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Number of Business Days Before the Notice of Redemption to Warrant Holders Number of business days before the notice of redemption to warrant holders Redemption price per share or per unit of warrants or rights outstanding. Class of Warrant or Right, Redemption Price of Warrants or Rights Redemption price (in dollars per share) Period for warrants to exercise after the completion of a business combination, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Period to Exercise Warrants after Business Combination Period to exercise warrants after business combination Number of votes entitled for one common stock. Number of Voting Rights Per Share Number of voting rights per share Period for warrants to exercise after the completion of public offering, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Period to Exercise Warrants after Public offerings Period to exercise warrants after public offerings The percentage of ownership of the entity's issued and outstanding shares by initial shareholders after a proposed public offering. Shareholder Ownership Percentage in Parent After Stock Transaction Percentage of shares owned by initial stockholders Period of written notice of redemption of stock, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Notice Period for Redemption Notice period for redemption Amount of working capital (deficit) i.e., calculated based on current assets less current liabilities. Working Capital Deficit Working capital Liquidity and Capital Resources [Abstract] Liquidity and Capital Resources [Abstract] Maximum borrowing capacity under the related party loan without consideration of any current restrictions on the amount that could be borrowed. Related Party Loan, Maximum Borrowing Capacity Loan commitment amount Amount of working capital loan which can be exchanged for a specified amount of another security at the option of the issuer or holder. Working Capital Loan, Convertible Working capital loan Related Party Loans [Abstract] Related Party Loans [Abstract] Administrative Support Agreement [Abstract] Administrative Support Agreement [Abstract] Number of securities into which each unit may be converted. For example, but not limited to, each unit may be converted into two shares. Number of Securities Called by Each Unit Number of shares called by each unit (in shares) Sale of Public Offering [Abstract] Public Offering [Abstract] Disclosure of accounting policy for common stock subject to possible redemption. Common Stock Subject to Possible Redemption [Policy Text Block] Common Stock Subject to Possible Redemption Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities allocated for payment of income taxes. Investment Income Interest, Allocated for Income Taxes Less: interest available to be withdrawn for payment of taxes Amount of noncash reversal of expense for of deferred offering costs over accrual. Reversal of Deferred Offering Costs Over Accrual Reversal of deferred offering costs over accrual The increase (decrease) during the reporting period in the obligations related to franchise tax payable. Increase (Decrease) in Franchise Tax Payable Franchise tax payable The cash inflow associated with the sale of investments that are pledged or subject to withdrawal restrictions during the period for the payment of tax obligations. Proceeds from Sale of Restricted Investments, for Payment of Taxes Trust Account withdrawals for the payment of franchise taxes and income taxes The amount of change in value of common stock subject to redemption from noncash transactions. Increase Decrease in Value of Common Stock Subject to Redemption Change in value of common stock subject to possible redemption The cash inflow associated with the sale of investments that are pledged or subject to withdrawal restrictions during the period for redemption of common stock. Proceeds from Sale of Restricted Investments, for Redemption of Common Stock Trust Account withdrawal for redemption of common stock Common shares that are not redeemable before liquidation of the entity. Nonredeemable Common Stock [Member] Non-Redeemable Common Stock [Member] Amount of franchise tax expense incurred during the period. Franchise Tax Expense Franchise tax expense The number of the entity's new shares purchased by related party and transferred to independent directors nominees and officers. Related Party Transaction, Stock Issued During Period, Shares Transferred Number of founder shares transferred (in shares) The minimum period after the initial business combination that founder shares can be transferred, assigned or sold on the basis of sale price, subject to certain conditions. Minimum Period After Initial Business Combination to Transfer Founder Shares Minimum days after business combination Executive of the entity that is appointed to the position by the board of directors. Officer 3 [Member] Messrs. Patel [Member] Executive of the entity that is appointed to the position by the board of directors. Officer 1 [Member] Messrs. Hunter [Member] Executive of the entity that is appointed to the position by the board of directors Officer 2 [Member] Messrs. Beem [Member] Person nominated for independent director. Independent Director Nominee 2 [Member] Messrs. Clark [Member] Person nominated for independent director. Independent Director Nominee 1 [Member] Messrs. Uren [Member] Person nominated for independent director. Independent Director Nominee 3 [Member] Messrs. Grant [Member] A Delaware limited liability company that provides certain management support and administrative oversight services including the organization and sale of stock, investment funds.. AMCI Sponsor LLC [Member] Sponsor [Member] Ratio applied for conversion of stock from one class to other, for example but not limited to, one share converted to two or two shares converted to one. Stock Conversion Ratio Stock conversion ratio The sale price of common stock on which founder shares can be transferred, assigned or sold. Sale Price of Common Stock on Which Founder Shares can be Transferred Sale price (in dollars per share) The threshold number of trading days within a specified consecutive trading period the common stock closing price of the entity's common stock must exceed threshold of closing price in order to transfer, assign or sale. Common Stock Closing Sale Price Threshold Number Of Trading Days Number of trading days The period of time after the consummation of initial business combination during which the transfer, assignment or sale of the founder shares is restricted, subject to certain conditions in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Restricted Period to Transfer, Assign or Sell Founder Shares Restricted period to transfer, assign or sell founder shares The threshold period of consecutive trading days during which the common stock closing price of the entity's common stock must exceed the stated closing price for specified number of trading days in order to transfer, assign or sale. Common Stock Closing Sale Price Consecutive Trading Days Number of consecutive trading days Consecutive trading day period Founder Shares [Abstract] Founder Shares [Abstract] Amount deposited in dollars per each share of common stock that was not redeemed at the special meeting) will be deposited into the Trust Account for each calendar month, or portion thereof, that is needed by the Company to complete an initial business combination. Amount Deposited in Trust Account, Per Share Amount deposited in trust account (in dollars per share) Amount of other costs incurred in connection with the offering of units in initial public offering and private placement of warrants. Other Offering Costs Other costs Number of sponsors shares cancelled during the period. Number Of Sponsors Shares Cancelled Common stock subject to possible forfeiture (in shares) Founder shares forfeited (in shares) Amount of costs incurred for offering of Units in Initial Public Offering and Private Placement of Warrants. Offering Costs Offering costs Aggregate costs incurred for underwriting discounts and commissions earned by the underwriters in initial public offering and private placement of warrants. Underwriting Fees Underwriting fees The aggregate value of shares available for purchase. Equity Unit Purchase Agreement, Value Aggregate value of units available for sale The maximum number of units permitted to be issued. Units, Shares Authorized Contingent number of units authorized (in shares) The amount of interest to pay dissolution expenses. Interest to Pay Dissolution Expenses Interest to pay dissolution expenses Business Operations [Abstract] Business Operations [Abstract] A contingent forward purchase agreement with the sponsor to purchase units from the entity. Forward Purchase Units Offering [Member] Forward Purchase Units [Member] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Organization and Business Operations [Line Items] Number of new units issued during the period. Each unit consists of one share of Class A common stock and one redeemable warrant. Units Issued During Period, Shares New Issues Units issued (in shares) Sale of units (in shares) Disclosure of information about the description of organization and business operations. Organization and Business Operations [Table] Number of warrants or rights issued during the period. Class of Warrant or Right Issued Warrants issued (in shares) Warrants issued (in shares) Period, that management agreed not to transfer, assign or sell any of warrants subject to limited exceptions in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Period Not to Transfer, Assign or Sell Warrants Period not to transfer, assign or sell warrants Private Placement Warrant [Abstract] Private Placement Warrants [Abstract] Security that gives the holder the right to purchase one share of Class A common stock at a specific exercise price. Private Placement Warrant [Member] Private Placement Warrant [Member] The aggregate carrying value of deferred underwriting discounts and commissions earned by the underwriters in initial public offering payable beyond the normal operating cycle, if longer. Deferred Underwriting Fee Noncurrent Deferred underwriting fees Carrying value as of the balance sheet date of obligations incurred and payable for franchise tax payable. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Franchise Tax Payable, Current Franchise tax payable The entire disclosure of sale of warrants in a private placement offering. Private Placement Warrants Disclosure [Text Block] Private Placement Warrants Private Placement Warrants [Abstract] Equity impact of the increase (decrease) in value of shares subject to mandatory redemption value. Increase (Decrease) in Shares Subject to Mandatory Redemption, Value Change in common stock subject to possible redemption Equity impact of the increase (decrease) in the number of shares subject to mandatory redemption value. Increase (Decrease) in Shares Subject to Mandatory Redemption, Shares Change in common stock subject to possible redemption (in shares) The entire disclosure for public offering. Public Offering [Text Block] Initial Public Offering Initial Public Offering [Abstract]