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Tabular List, Table Tabular List [Table Text Block] Other Financial Information Additional Financial Information Disclosure [Text Block] Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Finance Lease Finance Lease, Liability [Abstract] Shares issued in reverse merger recapitalization (in shares) Stock Issued During Period, Shares, Reverse Stock Splits Goodwill [Line Items] Goodwill [Line Items] Adjustment to Compensation: Adjustment to Compensation [Axis] Government Assistance [Table] Government Assistance [Table] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Indian Ocean Rare Earth Metals Pte. Ltd. Indian Ocean Rare Earth Metals Pte. Ltd. [Member] Indian Ocean Rare Earth Metals Pte. Ltd. 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Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Contract liabilities Contract with Customer, Liability, Current Exercise Price (in dollars per share) Exercise price (in Dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Prepaid and other assets Increase (Decrease) in Prepaid Expense and Other Assets Total mezzanine equity Balances, beginning of period Balances, end of period Temporary Equity, Carrying Amount, Attributable to Parent Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Unamortized Compensation Costs Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount U.S. Federal statutory amount and rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Texas Mineral Resources Corporation Texas Mineral Resources Corporation [Member] Texas Mineral Resources Corporation Subsequent Event Type [Axis] Subsequent Event Type [Axis] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Cashless exercise to Common B Units (in shares) Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Cashless Exercise To Common B Units The number of non-vested equity-based payment instruments, cashless exercise to Common B Units. 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Washington, D.C. [Member] Washington, D.C. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Deferred Offering Costs Deferred Offering Costs [Policy Text Block] Disclosure of accounting policy for deferral offering costs Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Conversion of Stock [Line Items] Conversion of Stock [Line Items] Stock issued during period, value, issued for litigation settlement Stock Issued During Period, Value, Issued for Litigation Settlement Stock Issued During Period, Value, Issued for Litigation Settlement Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Earnout liabilities Business Combination, Contingent Consideration, Liability Leases Lessee, Leases [Policy Text Block] Amortization of intangible assets Amortization of Intangible Assets Deemed dividend - preferred accretion to redemption value Stock Redeemed or Called During Period, Value Expected volatility Measurement Input, Price Volatility [Member] Total lease liabilities Lease, Liability Lease, Liability Consecutive trading day period Business Combination, Trading Day Period, Consecutive Business Combination, Trading Day Period, Consecutive Capital expenditures and equipment deposits Capital expenditures and equipment deposits Payments to Acquire Productive Assets Wheat Ridge, CO Wheat Ridge, Colorado [Member] Wheat Ridge, Colorado Total Depreciation, Depletion and Amortization Payment-in-kind percentage of series A cumulative convertible preferred stock subject to possible redemption Temporary Equity, Payment-in-Kind Dividend Percentage Payment-in-kind percentage of temporary equity. Exchange ratio Debt Instrument, Convertible, Conversion Ratio Mark-to-market of warrants and earnouts Effective Income Tax Rate Reconciliation, Mark-to-Market of Warrants and Earnouts, Percent Effective Income Tax Rate Reconciliation, Mark-to-Market of Warrants and Earnouts, Percent Cash - IPXX Op Account (Blitzer note) Cash IPXXOp Account [Member] Cash IPXXOp Account Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Finished goods Inventory, Finished Goods, Gross United Kingdom Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Finance leases, non-current Total finance lease liabilities Finance Lease Liability Present value of future minimum lease payments Finance Lease, Liability Accretion of forward purchase agreements Adjustments to Paid in Capital, Accretion Of Forward Purchase Agreements Accretion of forward purchase agreements. Arrangement Duration Trading Arrangement Duration Computer equipment Computer Equipment [Member] Government award, increment amount payments Government Assistance, Increment Award Amounts Government Assistance, Increment Award Amounts Segments [Axis] Segments [Axis] Net operating losses Deferred Tax Assets, Net Operating Losses Deferred Tax Assets, Net Operating Losses 12% Series A Cumulative Convertible Preferred Stock Convertible Series A Preferred Stock [Member] Convertible Series A Preferred Stock Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Share price (in dollars per share) Share Price Other Payment for (Proceeds from) Other Investing Activity Other non-cash adjustments Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Net cash to USARE LLC Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent ASSETS Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Fair Value Measurements Fair Value Disclosures [Text Block] Loss on extinguishment Gain (Loss) on Extinguishment of Debt Cash received, excluding amounts recognized as revenue during the year Contract With Customer, Liability, Cash Receipts Contract With Customer, Liability, Cash Receipts Business Combination [Line Items] Business Combination [Line Items] Stockholders' equity Equity, Attributable to Parent [Abstract] Derivative liability Derivative Liability, Current Share-based compensation arrangement by share-based payment award, award vesting rights, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Deferred Tax Assets, Change in Valuation Allowance Deferred Tax Assets, Change in Valuation Allowance [Table Text Block] Deferred Tax Assets, Change in Valuation Allowance Operating leases, non-current Operating leases, non-current Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers March 2029 (2) March 2029 (2) [Member] March 2029 (2) Merger Transaction - Schedule of Net Proceeds from the Merger (Details) [Table] Merger Transaction - Schedule of Net Proceeds from the Merger (Details) [Table] Merger Transaction - Schedule of Net Proceeds from the Merger (Details) [Table] Cumulatively spent amount Government Assistance, Qualified Costs Spent Government Assistance, Qualified Costs Spent Weighted Average Exercise Price, dividends (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Nonvested, Weighted Average Exercise Price, Dividends Weighted average exercise price, dividends. 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Intrinsic Value, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Weighted Average Grant Date Fair Value, Awarded (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Foreign Deferred Foreign Income Tax Expense (Benefit) Stated interest rate on Note Interest Expense, Debt Business combination, equity conversion ratio Business Combination, Equity Conversion Ratio Business Combination, Equity Conversion Ratio Earnout Liabilities Earnout Liabilities [Policy Text Block] Disclosure of accounting policy for earnout liabilities. Entity Addresses [Line Items] Entity Addresses [Line Items] Name Trading Arrangement, Individual Name Converted to common stock Stock Issued During Period, Value, Conversion of Units Other issuances / Transaction bonus Stock Issued During Period, Value, Other Warrants, measurement input Warrants and Rights Outstanding, Measurement Input Principal amount Debt Instrument, Face Amount Consulting and professional services Consulting and Professional Services [Member] Consulting and Professional Services Schedule of Compensation Expense Share-Based Payment Arrangement, Activity [Table Text Block] Total operating expenses Operating Costs and Expenses Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Equity consideration Business Combination, Consideration Transferred, Equity Interest Preferred Stock Preferred Stock [Member] USARE LLC Convertible Preferred unit dividends Temporary Equity, Accretion of Dividends Name Awards Close in Time to MNPI Disclosures, Individual Name Weighted Average Grant Date Fair Value , beginning balance (in dollars per share) Weighted Average Grant Date Fair Value , ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value USARE LLC Class C Convertible Preferred Units Class C Convertible Preferred Warrants [Member] Class CConvertible Preferred Warrants Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Floor price (in dollars per share) Stock Issued During Period, Reset Price, Minimum Stock Issued During Period, Reset Price, Minimum ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Conversions Conversions of 12% Series A Cumulative Convertible Preferred Stock Stock Issued During Period, Value, Conversion of Convertible Securities Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Schedule of Future Minimum Finance Lease Payments Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Exercise of warrants (in shares) Stock Issued During Period, Shares, Exercise of Warrants Stock Issued During Period, Shares, Exercise of Warrants Liability Class [Axis] Liability Class [Axis] Foreign Foreign Tax Jurisdiction [Member] Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Deferred tax assets: Deferred Tax Assets, Tax Deferred Expense [Abstract] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Investment in Round Top Mountain Deferred Tax Liabilities, Investments Inventories Increase (Decrease) in Inventories Government Assistance [Line Items] Government Assistance [Line Items] Schedule of Estimated Useful Lives of the Related Asset Schedule Of Estimated Useful Lives Of The Related Asset [Table Text Block] Tabular disclosure of estimated useful lives of the related asset. Initial Common Stock Shares Issuable Upon Exercise (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Number of shares used in per share calculations: * Number Of Shares Used In Per Share Calculations [Abstract] Number Of Shares Used In Per Share Calculations Prepayment of Forward Purchase Agreements Prepayment Of Forward Purchase Agreements Prepayment of forward purchase agreements. Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Schedule of Active Finance Leases Schedule of Active Finance Leases [Table Text Block] Schedule of Active Finance Leases Net Loss Attributable to USA Rare Earth, Inc. Earnings Per Share, Policy [Policy Text Block] Accretion of asset retirement obligations Accretion Asset Retirement Obligation, Accretion Expense Revenue Recognition Revenue [Policy Text Block] Total common stock, % of voting Number Of Votes For Each Share Of Common Stock Number Of Votes For Each Share Of Common Stock Schedule of Amortization Expense Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Total authorized (in shares) Total Authorized Number of shares authorized. Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability All Executive Categories All Executive Categories [Member] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Common Stock Common Stock, Value, Issued Finance lease-right-of-use assets, net Finance leases, included in property, plant and equipment, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Title and Position [Axis] Title and Position [Axis] Commitments and contingencies (Note 6) Commitments and Contingencies Equipment costs Property, Plant and Equipment, Gross, Construction In Progress, Equipment Costs Property, Plant and Equipment, Gross, Construction In Progress, Equipment Costs Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Common Stock shares Common Stock Shares, September 2025 Agreement Closing Date [Member] Common Stock Shares, September 2025 Agreement Closing Date Business Combination [Axis] Business Combination [Axis] Comprehensive loss attributable to USA Rare Earth, Inc. Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Non-Controlling Interest Noncontrolling Interest [Member] US Dept of Commerce US Dept of Commerce [Member] US Dept of Commerce Funding Type [Axis] Funding Type [Axis] Funding Type Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Deferred tax assets, net Deferred Tax Assets, Net Interest expense and other income (loss), net Other Nonoperating Expense PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Warrants to be issued (in shares) Government Assistance, Covenant, Warrants to be Issued Government Assistance, Covenant, Warrants to be Issued All other customers All Other Customers [Member] All Other Customers Revenue from Contract with Customer [Abstract] Issuance of preferred stock and warrants, net of issuance costs (in shares) Temporary Equity, Stock Issued During Period, Shares, New Issues Temporary Equity, Stock Issued During Period, Shares, New Issues Scenario [Axis] Scenario [Axis] Deferred tax liability Business Combination, Recognized Liability Assumed, Deferred Tax Liability Reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves PIPE financing (in shares) Stock Issued During Period, Shares, Private Investment in Public Equity Stock Issued During Period, Shares, Private Investment in Public Equity Note Payable [Line Items] Note Payable [Line Items] Note Payable [Line Items] All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Share-based compensation arrangement by share-based payment award, award vesting rights, conversion ratio Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Rights, Conversion Ratio Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Rights, Conversion Ratio Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Consultants Consultants [Member] Consultants Percentage of transfer of shares after year two Percentage Of Transfer Shares Locked-up, Period Two Percentage Of Transfer Shares Locked-up, Period Two Exercise price Measurement Input, Exercise Price [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Common Stock shares Common Stock Shares, May 2025 Agreement Closing Date [Member] Common Stock Shares, May 2025 Agreement Closing Date Geographical [Axis] Geographical [Axis] Transaction Type [Axis] Transaction Type [Axis] Schedule of Material Property Leases Schedule of Material Property Leases [Table Text Block] Schedule of Material Property Leases Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Net cash used by USARE LLC Net Cash Used by USA RE LLC Net cash used by USARE LLC. Pre-merger shares Pre-merger Shareholders [Member] Pre-merger Shareholders Pro Forma Revenue Business Combination, Pro Forma Information, Pro Forma Revenue Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] $75M PIPE $75 Million Private Investment in Public Equity [Member] $75 Million Private Investment in Public Equity Forecast Forecast [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Payroll and related employee taxes Accrued Payroll Taxes, Current Temporary equity, liquidation value Temporary Equity, Liquidation Preference Accounts payable Accounts Payable Prepaid insurance Prepaid Insurance Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] Maximum award Government Assistance, Award Amount Net loss per share attributable to USA Rare Earth, Inc.: * Earnings Per Share [Abstract] Converted shares (in shares) Conversion of Stock, Shares Converted Variable Interest Entity (Details) [Line Items] Variable Interest Entity (Details) [Line Items] Variable Interest Entity (Details) [Line Items] Total other expense, net Nonoperating Income (Expense) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule Of Unamortized Compensation Cost And Weighted Average Service Period Schedule of Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized [Table Text Block] Schedule of Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized Contract liabilities Increase (Decrease) in Contract with Customer, Liability Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Government Assistance, Type [Domain] Government Assistance, Type [Domain] Class A common unit price Measurement Input Class A Common Unit Price [Member] Measurement Input Class ACommon Unit Price Award Timing Disclosures [Line Items] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Exploration and Evaluation Costs Oil and Gas, Internal Cost Capitalization [Policy Text Block] Payments for legal settlements Payments for Legal Settlements Mezzanine and Stockholders’ Equity Equity [Text Block] Interest rate Debt Instrument, Interest Rate During Period Net loss attributable to USA Rare Earth, Inc. Net loss attributable to USA Rare Earth, Inc. Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Operating Lease Operating Lease, Liability [Abstract] Construction in progress Construction in Progress [Member] Other Other Accrued Liabilities, Current Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Share-based compensation arrangement by share-based payment award, award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Class A-1 And Class A-2 Class A-1 And Class A-2 [Member] Class A-1 And Class A-2 Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Revolving credit facility Proceeds from Loans Price per share (in dollars per share) Shares Issued, Price Per Share Customer [Axis] Customer [Axis] Remaining term (in years) Measurement Input, Expected Term [Member] Customer relationships Customer Relationships [Member] Loss from operations Operating Income (Loss) Accumulated deficit Retained Earnings (Accumulated Deficit) Business Combination Agreement Business Combination Agreement [Member] Business Combination Agreement Supplier Concentration Risk Supplier Concentration Risk [Member] Exchange of shares (in shares) Excess Stock, Shares Issued Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Deferred Tax Assets Valuation Allowance [Roll Forward] Deferred Tax Assets Valuation Allowance [Roll Forward] Deferred Tax Assets Valuation Allowance Volume-weighted average price, period Preferred Stock, Volume-Weighted Average Price, Period Preferred Stock, Volume-Weighted Average Price, Period USARE LLC Warrants to Acquire Class C Preferred Units USA RE LLC Warrants To Acquire Class C Preferred Units [Member] USARELLCWarrants To Acquire Class CPreferred Units Class of Stock [Axis] Class of Stock [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Earnout and Forward Purchase Agreements Earnout and Forward Purchase Agreements [Member] Earnout And Forward Purchase Agreements Statement [Table] Statement [Table] Total Cash in IPXX going into the Merger Total Cash and Cash Equivalents Before the Merger Amount of cash and cash equivalents before the merger. Adjustments to reconcile net loss to cash used in operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Nondeductible/nontaxable items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Revenue Benchmark Revenue Benchmark [Member] Risk-free interest rate Measurement Input, Risk Free Interest Rate [Member] Total purchase price Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Common Stock Shares and Warrants Issued (in shares) Common Stock Shares and Warrants Issued Common Stock Shares and Warrants Issued Contract liabilities, beginning of year Contract liabilities, end of year Contract with Customer, Liability $125M PIPE $125 Million Private Investment in Public Equity [Member] $125 Million Private Investment in Public Equity Finance leases, non-current Finance leases, non-current Finance Lease, Liability, Noncurrent Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Merger Transaction - Schedule of Equity Instruments Outstanding (Details) [Table] Merger Transaction - Schedule of Equity Instruments Outstanding (Details) [Table] Merger Transaction - Schedule of Equity Instruments Outstanding (Details) [Table] Conversion ratio Share-Based Compensation Arrangement by Share-Based Payment Award, Conversion of Stock, Ratio Share-Based Compensation Arrangement by Share-Based Payment Award, Conversion of Stock, Ratio Fourth Anniversary Fourth Anniversary [Member] Fourth Anniversary Termination Date Trading Arrangement Termination Date 2024 Incentive Plan 2024 Incentive Plan [Member] 2024 Incentive Plan Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Conversion price reduced (in dollars per share) Preferred Stock, Convertible, Conversion Price, Decrease Cash - PIPE investment Cash PIPEInvestment [Member] Cash PIPEInvestment Equity-Based Compensation (Details) [Table] Equity-Based Compensation (Details) [Table] Equity-Based Compensation (Details) [Table] Gain on derivative liability Derivative, Gain on Derivative Asset retirement obligation Business Combination, Recognized Liability Assumed, Asset Retirement Obligation Business Combination, Recognized Liability Assumed, Asset Retirement Obligation Discount rate Operating Lease, Weighted Average Discount Rate, Percent Revenue recognized Contract With Customer, Liability, Revenue Recognized, Excluding Opening Balance Contract With Customer, Liability, Revenue Recognized, Excluding Opening Balance Schedule of Activity Related to Incentive Units Share-Based Payment Arrangement, Option, Activity [Table Text Block] Basic (in shares) Weighted average shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Warrant liabilities Warrants and Rights Outstanding Equipment deposits Equipment Deposits The amount of equipment deposits. Schedule of Income (Loss) Per Share Attributable to Holders of Common Stock Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Director Director [Member] Proceeds from government grants Proceeds From Government Grants Proceeds From Government Grants Related Party Transaction [Domain] Related Party Transaction [Domain] Subsequent Events [Abstract] Segment Reporting [Abstract] Finite-lived Intangible Assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Equity-Based Compensation - Schedule of Compensation Expense (Details) [Table] Equity-Based Compensation - Schedule of Compensation Expense (Details) [Table] Equity-Based Compensation - Schedule of Compensation Expense (Details) [Table] Cost of revenue Cost of Revenue Supplier [Domain] Supplier [Domain] Other expense, net: Nonoperating Income (Expense) [Abstract] Scenario [Domain] Scenario [Domain] Undistributed net loss attributable to USA Rare Earth, Inc. Undistributed Earnings (Loss) Available to Common Shareholders, Basic Percentage of shares outstanding, warrants issued Government Assistance, Covenant, Warrants Issued, Percentage of Common Stock Outstanding Government Assistance, Covenant, Warrants Issued, Percentage of Common Stock Outstanding Balance Sheet Classification Warrant or Right, Reason for Issuance, Description Mezzanine and Stockholders’ Equity [Table] Mezzanine and Stockholders’ Equity [Table] Mezzanine and Stockholders’ Equity Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value Recurring Basis (Details) [Table] Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Mezzanine and Stockholders’ Equity - Schedule of Warrants to Acquire Common stock (Details) [Table] Mezzanine and Stockholders’ Equity - Schedule of Warrants to Acquire Common stock (Details) [Table] Mezzanine and Stockholders’ Equity - Schedule of Warrants to Acquire Common stock (Details) [Table] Grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross $1.50 Billion Private Investment in Public Equity $1.50 Billion Private Investment in Public Equity [Member] $1.50 Billion Private Investment in Public Equity Use of Estimates Use of Estimates, Policy [Policy Text Block] 2024 Omnibus Incentive Plan Two Thousand Twenty Four Omnibus Incentive Plan [Member] Two Thousand Twenty Four Omnibus Incentive Plan Subsequent Event Subsequent Events [Text Block] Translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Gross cash proceeds Proceeds from Issuance of Warrants Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Other selling, general and administrative Product and Service, Other [Member] Raw materials Inventory, Raw Materials, Gross Dilution of non-controlling interest Noncontrolling Interest, Dilution Represent the amount of dilution of non-controlling interest. Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Settlement of the Note upon conversion Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Research and Development Costs In Process Research and Development, Policy [Policy Text Block] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Shares issue in reverse recapitalization Temporary Equity,Stock Issued During Period, Value, Reverse Stock Splits Temporary Equity,Stock Issued During Period, Value, Reverse Stock Splits Other issuances (in shares) Stockholders' Equity, Other Shares Other deferred Deferred Tax Assets, Tax Deferred Expense, Other Deferred grants Deferred Grants The amount of deferred grants. Third Anniversary Third Anniversary [Member] Third Anniversary Stock issuance Stock Issued During Period, Value, New Issues Legal Accrued Legal Fees, Current Accrued Legal Fees, Current Share-based compensation Share-based Compensation [Member] Share-based Compensation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Warrants Warrants [Policy Text Block] Accounting policies for warrants. Useful Life, Lease Term [Member]