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Non-controlling interest Equity, Attributable to Noncontrolling Interest Proceeds from issuance of USARE LLC Preferred units Proceeds from Issuance of Preferred Stock and Preference Stock Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Extinguishment of note payable Stock Issued During Period, Value, Extinguishment Of Note Payable Represent the amount of extinguishment of note payable. Tabular List, Table Tabular List [Table Text Block] USARE LLC Convertible Preferred unit dividends (in shares) Temporary Equity, Accretion of Dividends, Shares Temporary Equity, Accretion of Dividends, Shares Customer 4 Customer Four [Member] Customer Four 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three 2026 (remaining six months) Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Performance restricted stock units Performance Restricted Stock Units [Member] Performance Restricted Stock Units Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Selling, general and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Conversions Stock Issued During Period, Value, Conversion of Convertible Securities Business Combination, Contingent Consideration, Type [Domain] Business Combination, Contingent Consideration, Type [Domain] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Accrued and other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Capital expenditures and equipment deposits Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable Contract liabilities related to acquisition Contract with Customer, Liability, Related To Acquisition Contract with Customer, Liability, Related To Acquisition Common stock, shares issued, not disclosed Common Stock, Shares Issued, Not Disclosed Common Stock, Shares Issued, Not Disclosed Name Measure Name Construction in progress - Buildings Property, Plant and Equipment, Gross, Construction In Progress, Building Construction Costs Property, Plant and Equipment, Gross, Construction In Progress, Building Construction Costs Income Taxes Income Tax Disclosure [Text Block] Government Assistance [Table] Government Assistance [Table] Revenue recognized related to amounts included in balance, beginning of period Contract With Customer, Liability, Revenue Recognized, Excluding Opening Balance Contract With Customer, Liability, Revenue Recognized, Excluding Opening Balance Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt instrument, annual ticking fee percentage Debt Instrument, Annual Ticking Fee Percentage Debt Instrument, Annual Ticking Fee Percentage Equipment deposits Equipment Deposits The amount of equipment deposits. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total consideration Business Combination, Consideration Transferred Proceeds from government grants Proceeds From Government Grants Proceeds From Government Grants Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category 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] Accrued liabilities Accrued Liabilities Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Mezzanine and Stockholders’ Equity [Table] Mezzanine and Stockholders’ Equity [Table] Mezzanine and Stockholders’ Equity Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Total depreciation and amortization Depreciation, Depletion and Amortization Total inventories Inventory, 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 Stock, Class of Stock [Table] Stock, Class of Stock [Table] Net loss Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Market price per share (in dollars per share) Business Combination, Price Per Share Finance right of use assets obtained in exchange for finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Current assets Assets, Current [Abstract] Government Assistance, Type [Domain] Government Assistance, Type [Domain] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Non-cash lease liabilities arising from obtaining right of use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Depreciation expense Depreciation, Nonproduction Shares issued in reverse merger recapitalization Stock Issued During Period, Value, Reverse Stock Splits Issuance of Common Stock in reverse recapitalization merger. Government grant program Stock Issued During Period, Government Grant Program, Value Stock Issued During Period, Government Grant Program, Value Benefit from income taxes Income Tax Expense (Benefit) Payment of deferred government loan costs Payments of Loan Costs Foreign currency transactions Gain (Loss), Foreign Currency Transaction, before Tax Litigation Litigation [Member] Litigation Customer Concentration Risk Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Lab equipment Lab Equipment [Member] Lab Equipment Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Funding Type [Domain] Funding Type [Domain] Funding Type [Domain] Earnout Shares Earnout Shares [Member] Earnout Shares Dilution of non-controlling interest Noncontrolling Interest, Dilution Represent the amount of dilution of non-controlling interest. Other intangible assets, net Other Intangible Assets, Net VIE Variable Interest Entity, Primary Beneficiary [Member] Other Other Current Assets Other Current Assets Government Grant Warrant Warrants and Rights Outstanding, Government Grant Warrant Liability Warrants and Rights Outstanding, Government Grant Warrant Liability Net loss attributable to USA Rare Earth, Inc. Net loss attributable to USA Rare Earth, Inc. Net loss attributable to USA Rare Earth, Inc. Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Series A Warrant Warrant Liability [Member] Warrant Liability Equipment Purchase Order Equipment Purchase Order [Member] Equipment Purchase Order Statement [Table] Statement [Table] Shares issued in reverse recapitalization Temporary Equity, Stock Issued During Period, Value, Reverse Stock Splits Temporary Equity, Stock Issued During Period, Value, Reverse Stock Splits Restatement Determination Date: Restatement Determination Date [Axis] Interest income Investment Income, Interest Deferred grant income Deferred Grants The amount of deferred grants. Schedule of Contract With Customer, Contract Liability, Activity Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Legal Accrued Legal Fees, Current Accrued Legal Fees, Current Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Establishment of liability Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Issues Earnout liability Earnout Liabilities The amount of earnout liabilities. Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] PIPE Financing PIPE Financing [Member] PIPE Financing Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Non-cash Transactions Other Noncash Investing and Financing Items [Abstract] Beginning balance Ending balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Mezzanine equity Temporary Equity [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]